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Stockholder's Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Summary of Common Stock Shares Activity | The following table summarizes common stock share activity for the three months ended March 31, 2020 and 2019 (dollars in thousands):
|  | 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 |  |  | 97,413,721 |  |  | $ | 97 |  |  | $ | 284,226 |  |  | $ | (271,428 | ) |  | $ | 12,895 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,002 | ) |  |  | (7,002 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 410 |  |  |  | — |  |  |  | 410 |
Common stock issued through employee stock purchase plan |  |  | 22,143 |  |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Common stock issued, net of expenses |  |  | 285,276 |  |  |  | 1 |  |  |  | 206 |  |  |  | — |  |  |  | 207 |
Common stock issued for vested restricted stock units |  |  | 154,902 |  |  |  | — |  |  |  | (73 | ) |  |  | — |  |  |  | (73 | )
Balance, March 31, 2020 |  |  | 97,876,042 |  |  | $ | 98 |  |  | $ | 284,787 |  |  | $ | (278,430 | ) |  | $ | 6,455 |
|  | Three Months Ended March 31, 2019 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, December 31, 2018 |  |  | 47,971,989 |  |  | $ | 48 |  |  | $ | 248,895 |  |  | $ | (217,718 | ) |  | $ | 31,225 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (22,908 | ) |  |  | (22,908 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 492 |  |  |  | — |  |  |  | 492 |
Common stock issued through employee stock purchase plan |  |  | 19,259 |  |  |  | — |  |  |  | 20 |  |  |  | — |  |  |  | 20 |
Common stock issued, net of expenses |  |  | 2,226,569 |  |  |  | 2 |  |  |  | 2,507 |  |  |  | — |  |  |  | 2,509 |
Common stock issued for vested restricted stock units |  |  | 14,612 |  |  |  | — |  |  |  | (8 | ) |  |  | — |  |  |  | (8 | )
Balance, March 31, 2019 |  |  | 50,232,429 |  |  | $ | 50 |  |  | $ | 251,906 |  |  | $ | (240,626 | ) |  | $ | 11,330 |
Common Stock Reserved For Future Issuances | The Company had reserved shares of common stock for future issuance as follows:
| March 31, 2020 |  |  | December 31, 2019 |
Outstanding stock options |  | 7,684,762 |  |  |  | 5,261,860 |
Outstanding restricted stock units |  | 862,514 |  |  |  | 966,394 |
Warrants to purchase common stock associated with June 2016 Public Offering |  | 4,218,750 |  |  |  | 4,218,750 |
Warrants to purchase common stock associated with March 2018 Public Offering – Series 2 |  | 7,988,175 |  |  |  | 7,988,175 |
Warrants to purchase common stock associated with December 2019 Public Offering |  | 44,722,222 |  |  |  | 44,722,222 |
Option to purchase common stock associated with December 2019 Public Offering |  | — |  |  |  | 5,833,333 |
Warrants to purchase common stock associated with Solar loan agreement |  | 122,435 |  |  |  | 122,435 |
For possible future issuance for the conversion of the 6% senior convertible notes |  | 11,382,000 |  |  |  | 11,382,000 |
For possible future issuance under 2014 Equity Incentive Plan (Note 9) |  | 1,900,861 |  |  |  | 554,774 |
For possible future issuance under Employee Stock Purchase Plan |  | 81,499 |  |  |  | 74,231 |
For possible future issuance under 2015 Inducement Award Plan (Note 9) |  | 315,500 |  |  |  | 315,500 |
Total common shares reserved for future issuance |  | 79,278,718 |  |  |  | 81,439,674 |

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