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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of Common Stock Shares Activity | The following table summarizes common stock share activity for the three and nine months ended September 30, 2021 and 2020 (dollars in thousands):
|  | Three Months Ended September 30, 2021 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, June 30, 2021 |  |  | 23,147,552 |  |  | $ | 26 |  |  | $ | 361,925 |  |  | $ | (329,631 | ) |  | $ | 32,320 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (605 | ) |  |  | (605 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 588 |  |  |  | — |  |  |  | 588 |
Common stock issued through employee stock purchase |  |  | 2,759 |  |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | 13 |
Common stock issued, net of expenses |  |  | 733,937 |  |  |  | 1 |  |  |  | 5,300 |  |  |  | — |  |  |  | 5,301 |
Common stock issued for vested restricted stock units |  |  | 1,322 |  |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | (3 | )
Balance, September 30, 2021 |  |  | 23,885,570 |  |  | $ | 27 |  |  | $ | 367,823 |  |  | $ | (330,236 | ) |  | $ | 37,614 |
|  | Nine Months September 30, 2021 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, December 31, 2020 |  |  | 19,663,698 |  |  | $ | 20 |  |  | $ | 349,351 |  |  | $ | (326,613 | ) |  | $ | 22,758 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,623 | ) |  |  | (3,623 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 1,528 |  |  |  | — |  |  |  | 1,528 |
Common stock issued through employee stock purchase |  |  | 4,943 |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | 22 |
Common stock issued, net of expenses |  |  | 3,250,739 |  |  |  | 6 |  |  |  | 8,707 |  |  |  | — |  |  |  | 8,713 |
Common stock issued for conversion of April 2020 Notes |  |  | 959,080 |  |  |  | 1 |  |  |  | 7,452 |  |  |  | — |  |  |  | 7,453 |
Common stock issued for vested restricted stock units |  |  | 7,110 |  |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | (3 | )
Vested Loan Agreement warrants |  |  | — |  |  |  | — |  |  |  | 766 |  |  |  | — |  |  |  | 766 |
Balance, September 30, 2021 |  |  | 23,885,570 |  |  | $ | 27 |  |  | $ | 367,823 |  |  | $ | (330,236 | ) |  | $ | 37,614 |
|  | Three Months Ended September 30, 2020 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, June 30, 2020 |  |  | 10,478,927 |  |  | $ | 10 |  |  | $ | 291,134 |  |  | $ | (284,811 | ) |  | $ | 6,333 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 909 |  |  |  | 909 |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 399 |  |  |  | — |  |  |  | 399 |
Common stock issued, net of expenses |  |  | 315,939 |  |  |  | — |  |  |  | 1,909 |  |  |  | — |  |  |  | 1,909 |
Common stock issued through employee stock purchase plan |  |  | 2,284 |  |  |  | — |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
Common stock issued for vested restricted stock units |  |  | 969 |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Balance, September 30, 2020 |  |  | 10,798,119 |  |  | $ | 10 |  |  | $ | 293,450 |  |  | $ | (283,902 | ) |  | $ | 9,558 |
|  | Nine Months Ended September 30, 2020 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, December 31, 2019 |  |  | 9,741,372 |  |  | $ | 10 |  |  | $ | 284,313 |  |  | $ | (271,428 | ) |  | $ | 12,895 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (12,474 | ) |  |  | (12,474 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 1,220 |  |  |  | — |  |  |  | 1,220 |
Common stock issued through employee stock purchase plan and stock option plans |  |  | 4,652 |  |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | 28 |
Common stock issued, net of expenses |  |  | 647,504 |  |  |  | — |  |  |  | 4,578 |  |  |  | — |  |  |  | 4,578 |
Common stock issued for conversion of April 2020 Notes |  |  | 316,461 |  |  |  | — |  |  |  | 2,784 |  |  |  | — |  |  |  | 2,784 |
Common stock issued for commitment shares |  |  | 70,910 |  |  |  | — |  |  |  | 602 |  |  |  | — |  |  |  | 602 |
Common stock issued for vested restricted stock units |  |  | 17,220 |  |  |  | — |  |  |  | (75 | ) |  |  | — |  |  |  | (75 | )
Balance, September 30, 2020 |  |  | 10,798,119 |  |  | $ | 10 |  |  | $ | 293,450 |  |  | $ | (283,902 | ) |  | $ | 9,558 |
Common Stock Reserved For Future Issuances | The Company had reserved shares of common stock for future issuance as follows:
|  | September 30, 2021 |  |  | December 31, 2020 |
Outstanding stock options |  |  | 1,643,506 |  |  |  | 830,343 |
Outstanding restricted stock units |  |  | 149,134 |  |  |  | 29,087 |
Warrants to purchase common stock associated with June 2016 Public Offering |  |  | — |  |  |  | 421,867 |
Warrants to purchase common stock associated with March 2018 Public Offering – Series 2 |  |  | 798,810 |  |  |  | 798,810 |
Warrants to purchase common stock associated with December 2019 Public Offering |  |  | 4,472,205 |  |  |  | 4,472,205 |
Warrants to purchase common stock associated with December 2020 Public Offering - Series 1 |  |  | 6,439,866 |  |  |  | 6,800,000 |
Warrants to purchase common stock associated with December 2020 Public Offering - Series 2 |  |  | 6,800,000 |  |  |  | 6,800,000 |
Prefunded warrants to purchase common stock associated with December 2020 Public Offering |  |  | 3,200,000 |  |  |  | 5,260,000 |
Warrants to purchase common stock associated with Loan Agreement |  |  | 170,410 |  |  |  | — |
Warrants to purchase common stock associated with Solar loan agreement |  |  | — |  |  |  | 12,243 |
For possible future issuance for the conversion of the March 2019 Notes |  |  | 1,138,200 |  |  |  | 1,138,200 |
For possible future issuance for the conversion of the April 2020 Notes |  |  | — |  |  |  | 1,299,790 |
For possible future issuance under 2014 Plan (Note 8) |  |  | 184,497 |  |  |  | 146,488 |
For possible future issuance under Employee Stock Purchase Plan |  |  | 3,893 |  |  |  | 5,895 |
For possible future issuance under 2015 Plan (Note 8) |  |  | 231,450 |  |  |  | 14,050 |
Total common shares reserved for future issuance |  |  | 25,231,971 |  |  |  | 28,028,978 |

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