Borrowings - Additional Information (Details)
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1 Months Ended |
12 Months Ended |
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Mar. 07, 2019
USD ($)
d
$ / shares
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Sep. 30, 2016
USD ($)
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Jan. 31, 2021
USD ($)
shares
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Dec. 31, 2020
USD ($)
shares
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Jun. 30, 2020
USD ($)
shares
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Apr. 09, 2020
USD ($)
d
$ / shares
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Apr. 30, 2019
USD ($)
shares
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Dec. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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| Debt Instrument [Line Items] |
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| Payment of debt issuance costs |
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$ 494,000
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$ 1,253,000
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| Amortization of debt issuance costs and discount |
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1,201,000
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1,171,000
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| Loss on extinguishment of debt |
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1,766,000
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1,045,000
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| Net carrying amount of convertible debt and derivative liability |
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$ 16,516,000
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$ 16,516,000
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11,522,000
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| April 2020 Note Purchase Agreement |
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| Debt Instrument [Line Items] |
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| Date of issuance and sale of notes |
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Apr. 09, 2020
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| Face amount |
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$ 10,000,000.0
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| Proceeds from debt, net of issuance costs |
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9,500,000
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| Payment of debt issuance costs |
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$ 500,000
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| Purchase price as percentage of principal amount |
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100.00%
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| Interest rate |
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6.00%
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| Payment terms |
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The April 2020 Notes will bear interest at a rate of 6.0% per annum, payable semiannually in arrears on April 15 and October 15 of each year, beginning October 15, 2020. The April 2020 Notes will mature on April 15, 2026, unless earlier converted, redeemed or repurchased.
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| Notes maturity date |
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Apr. 15, 2026
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| Notes maturity description |
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The April 2020 Notes will mature on April 15, 2026, unless earlier converted, redeemed or repurchased
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| Senior convertible notes |
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1,200,000
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$ 1,200,000
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| Unamortized debt issuance cost |
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100,000
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100,000
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| Bifurcated embedded conversion option derivative liability |
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3,300,000
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3,300,000
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| Derivative, fair value |
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8,100,000
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8,100,000
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| Debt issuance costs |
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400,000
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400,000
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| Gain (loss) on fair value adjustment of derivative liability |
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1,700,000
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| Amortization of debt issuance costs and discount |
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200,000
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| Conversion of convertible note, amount |
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$ 2,000,000.0
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$ 2,000,000.0
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| Conversion of convertible note exchanged for shares | shares |
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322,348
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316,461
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| Loss on extinguishment of debt |
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$ 1,000,000.0
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$ 800,000
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| Net carrying amount of convertible debt and derivative liability |
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1,400,000
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2,000,000.0
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1,400,000
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| Fair value of the consideration issued |
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2,400,000
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$ 2,800,000
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2,400,000
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| Fair value of convertible debt and derivative liability |
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7,400,000
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$ 7,400,000
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| Conversion terms |
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holders of the April 2020 Notes may convert their April 2020 Notes at their option at any time prior to the close of business on the business day immediately preceding April 15, 2026 into shares of the Company’s common stock.
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| Conversion rate, number of shares to be issued per $1000 of principal (in shares) |
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111.1108
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| Principal amount of notes used as the denominator for conversion into notes |
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$ 1,000
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| Initial conversion price of notes | $ / shares |
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$ 9.00
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| Conversion rate, number of shares to be issued per $1000 of principal (in shares) after adjustment to certain events |
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1,938,600
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| Convertible notes, redemption start date |
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Apr. 15, 2023
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| Convertible notes, threshold percentage of stock price trigger |
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130.00%
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| Convertible notes, threshold trading days | d |
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20
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| Convertible notes, threshold consecutive trading days | d |
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30
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| Redemption price as percentage of the principal amount |
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100.00%
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| Redemption price as percentage of the principal amount subject to certain exceptions |
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100.00%
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| April 2020 Note Purchase Agreement | Subsequent Event |
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| Debt Instrument [Line Items] |
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| Conversion of convertible note, amount |
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$ 6,000,000.0
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| Conversion of convertible note exchanged for shares | shares |
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959,080
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| Senior Convertible Note Purchase Agreement |
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| Debt Instrument [Line Items] |
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| Date of issuance and sale of notes |
Mar. 07, 2019
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| Face amount |
$ 16,000,000.0
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| Proceeds from debt, net of issuance costs |
14,700,000
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| Payment of debt issuance costs |
$ 1,300,000
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| Purchase price as percentage of principal amount |
100.00%
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| Interest rate |
6.00%
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| Payment terms |
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The March 2019 Notes bear interest at a rate of 6.0% per annum payable semiannually in arrears on March 15 and September 15 of each year, beginning September 15, 2019. The March 2019 Notes will mature on March 15, 2025, unless earlier converted, redeemed or repurchased.
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| Notes maturity date |
Mar. 15, 2025
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| Notes maturity description |
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The March 2019 Notes will mature on March 15, 2025, unless earlier converted, redeemed or repurchased
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| Senior convertible notes |
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9,400,000
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$ 9,400,000
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8,300,000
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| Unamortized debt issuance cost |
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400,000
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400,000
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500,000
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| Bifurcated embedded conversion option derivative liability |
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2,700,000
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2,700,000
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3,200,000
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| Derivative, fair value |
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7,000,000.0
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7,000,000.0
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| Debt issuance costs |
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600,000
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600,000
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| Gain (loss) on fair value adjustment of derivative liability |
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500,000
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1,600,000
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| Amortization of debt issuance costs and discount |
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1,000,000.0
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1,100,000
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| Conversion of convertible note, amount |
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$ 2,000,000.0
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| Conversion of convertible note exchanged for shares | shares |
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162,600
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| Loss on extinguishment of debt |
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$ 200,000
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800,000
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| Net carrying amount of convertible debt and derivative liability |
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2,800,000
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| Fair value of the consideration issued |
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$ 3,000,000.0
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| Fair value of convertible debt and derivative liability |
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$ 12,900,000
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$ 12,900,000
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11,700,000
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| Conversion terms |
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holder of the March 2019 Notes may convert their March 2019 Notes at their option at any time prior to the close of business on the business day immediately preceding March 15, 2025 into shares of the Company’s common stock.
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| Conversion rate, number of shares to be issued per $1000 of principal (in shares) |
73.9096
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| Principal amount of notes used as the denominator for conversion into notes |
$ 1,000
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| Initial conversion price of notes | $ / shares |
$ 13.53
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| Conversion rate, number of shares to be issued per $1000 of principal (in shares) after adjustment to certain events |
81
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| Convertible notes, redemption start date |
Mar. 15, 2022
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| Convertible notes, threshold percentage of stock price trigger |
130.00%
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| Convertible notes, threshold trading days | d |
20
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| Convertible notes, threshold consecutive trading days | d |
30
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| Redemption price as percentage of the principal amount |
100.00%
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| Redemption price as percentage of the principal amount subject to certain exceptions |
100.00%
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| Reacquisition price of outstanding debt |
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15,900,000
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| Carrying value of debt obligation |
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$ 15,100,000
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| Principal amount of notes used as the denominator for conversion into notes after adjustment of certain events |
$ 1,000
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| Term Loan | Secured Debt |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 15,000,000.0
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| Loan agreement term |
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48 months
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| Term Loan | Secured Debt | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (as a percent) |
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8.49%
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