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Stockholders’ Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Summary of Common Stock Shares Activity | The following table summarizes common stock share activity for the three months ended March 31, 2021 and 2020 (dollars in thousands):
|  | Three Months Ended March 31, 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,676 | ) |  |  | (4,676 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 398 |  |  |  | — |  |  |  | 398 |
Common stock issued for conversion of April 2020 Notes |  |  | 959,080 |  |  |  | 1 |  |  |  | 7,452 |  |  |  | — |  |  |  | 7,453 |
Common stock issued through employee stock purchase plan |  |  | 2,184 |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 6 |
Common stock issued for vested restricted stock units |  |  | 675 |  |  |  | — |  |  |  | (15 | ) |  |  | — |  |  |  | (15 | )
Balance, March 31, 2021 |  |  | 20,625,637 |  |  | $ | 21 |  |  | $ | 357,192 |  |  | $ | (331,289 | ) |  | $ | 25,924 |
|  | Three Months Ended March 31, 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,002 | ) |  |  | (7,002 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 410 |  |  |  | — |  |  |  | 410 |
Common stock issued through employee stock purchase plan |  |  | 2,215 |  |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Common stock issued, net of expenses |  |  | 28,527 |  |  |  | — |  |  |  | 207 |  |  |  | — |  |  |  | 207 |
Common stock issued for vested restricted stock units |  |  | 15,490 |  |  |  | — |  |  |  | (73 | ) |  |  | — |  |  |  | (73 | )
Balance, March 31, 2020 |  |  | 9,787,604 |  |  | $ | 10 |  |  | $ | 284,875 |  |  | $ | (278,430 | ) |  | $ | 6,455 |
Common Stock Reserved For Future Issuances | The Company had reserved shares of common stock for future issuance as follows:
|  | March 31, 2021 |  |  | December 31, 2020 |
Outstanding stock options |  |  | 1,371,606 |  |  |  | 830,343 |
Outstanding restricted stock units |  |  | 96,974 |  |  |  | 29,087 |
Warrants to purchase common stock associated with June 2016 Public Offering |  |  | 421,867 |  |  |  | 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 |  |  | 6,800,000 |  |  |  | 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 |  |  | 5,260,000 |  |  |  | 5,260,000 |
Warrants to purchase common stock associated with Solar loan agreement |  |  | 12,243 |  |  |  | 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 Equity Incentive Plan (Note 9) |  |  | 318,097 |  |  |  | 146,488 |
For possible future issuance under Employee Stock Purchase Plan |  |  | 6,652 |  |  |  | 5,895 |
For possible future issuance under 2015 Inducement Award Plan (Note 9) |  |  | 14,050 |  |  |  | 14,050 |
Total common shares reserved for future issuance |  |  | 27,510,704 |  |  |  | 28,028,978 |

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