Quarterly report pursuant to Section 13 or 15(d)

Unaudited Condensed Consolidated Statements of Cash Flows

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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (13,383) $ (31,311)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 54 59
Stock-based compensation expense 821 938
Accretion of investments discount (23) (89)
Amortization of debt issuance costs and discount 599 573
Warrant liabilities fair value adjustment (8,329) 4,473
Change in fair value of derivative liabilities (1,393) 2,101
Noncash operating lease expense for right-of-use asset 97 81
Loss on extinguishment of debt 806 1,045
Noncash consideration associated with common stock purchase agreement 602 0
Changes in operating assets and liabilities:    
Prepaid expenses, other assets, deferred costs, and other 1,069 6,504
Accounts payable, accrued expenses, and other (3,833) 1,488
Deferred revenue 0 (121)
Net cash used in operating activities (22,913) (14,259)
Cash flows from investing activities:    
Maturities of investments 17,142 43,202
Purchases of property and equipment (4) 0
Purchases of investments (14,235) (26,585)
Net cash provided by investing activities 2,903 16,617
Cash flows from financing activities:    
Proceeds from common stock issued 2,751 6,761
Payments of offering costs and underwriting discounts and commissions (123) (203)
Proceeds from common stock issuance under employee stock purchase plan 18 21
Repurchase of shares to satisfy tax withholdings (73) 0
Proceeds from senior convertible notes 10,000 16,000
Payments of senior convertible notes issuance costs (462) (1,253)
Payment of loan payable expected to be refinanced 0 (15,973)
Net cash provided by financing activities 12,111 5,353
Net (decrease) increase in cash, cash equivalents, and restricted cash (7,899) 7,711
Cash, cash equivalents, and restricted cash at beginning of period 42,193 11,767
Cash, cash equivalents, and restricted cash at end of period 34,294 19,478
Supplemental cash flow information:    
Cash paid for interest 420 411
Cash received for interest 173 540
Noncash financing and investing activities:    
Operating lease liabilities arising from obtaining right-of-use assets 0 3,365
Deferred offering costs reclassified to additional-paid-in capital 0 4
Common stock issued for settlement of senior convertible notes 2,784 2,984
Deferred offering and issuance costs included in accounts payable and accrued expenses 106 0
Common stock issued for Commitment Shares $ 602 $ 0