Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Details)

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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 15,133,722 9,332,077 15,133,722 9,332,077
Outstanding stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 1,607,080 781,685 1,607,080 781,685
Outstanding restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 134,774 84,929 134,774 84,929
Warrants to purchase common stock associated with June 2016 Public Offering | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 0 421,867 0 421,867
March 2018 Public Offering Series 2 | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 798,810 798,810 798,810 798,810
December 2019 Public Offering | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 4,472,205 4,472,205 4,472,205 4,472,205
December 2020 Public Offering Series 2 | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 6,800,000 0 6,800,000 0
Warrants to purchase common stock associated with Loan Agreement | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 170,410 0 170,410 0
Warrants to purchase common stock associated with Solar loan agreement | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 12,243 12,243 12,243 12,243
Common stock associated with March 2019 Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 1,138,200 1,138,200 1,138,200 1,138,200
Common stock associated with April 2020 Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities (in shares) 0 1,622,138 0 1,622,138