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Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of summarizes stock option activities |
|  |  |  |  |  |  | Weighted Average
|  |  |  |  |  |  | Remaining
|  |  |  | Weighted Average |  | Contractual Life (in
|  | Stock Options |  | Exercise Price |  | years)
Outstanding at December 31, 2017 |  | 1,241,675 |  |  | 5.73 |  | 9.31
Options granted |  | — |  |  | — |  |
Outstanding at December 31, 2018 |  | 1,241,675 |  | $ | 5.73 |  | 8.31
Options granted |  | — |  |  | — |  | —
Outstanding at December 31, 2019 |  | 1,241,675 |  |  | 5.73 |  | 7.31
Options vested and exercisable at December 31, 2019 |  | 388,022 |  | $ | 5.73 |  | 7.31
Schedule of stock-based compensation expense |
|  | For the year ended December 31,
|  | 2019 |  | 2018
General and administrative |  | $ | 1,790 |  | $ | 3,664
Research and development |  |  | 874 |  |  | 1,296
Total stock-based compensation expense |  | $ | 2,664 |  | $ | 4,960
Schedule of warrant activity |
|  |  |  |  |  |  | Weighted Average
|  |  |  |  |  |  | Remaining
|  |  |  | Weighted Average |  | Contractual Life (in
|  | Warrants |  | Exercise Price |  | years)
Outstanding as of December 31, 2017 |  | 5,253,318 |  | $ | 8.28 |  | 3.89
Granted |  | — |  |  | — |  | —
Exercised |  | (42,620) |  |  | 4.25 |  | —
Outstanding as of December 31, 2018 |  | 5,210,698 |  | $ | 8.32 |  | 3.10
Granted |  | 288,184 |  |  | 3.47 |  | 9.25
Exercised |  | (93,213) |  |  | — |  | —
Outstanding as of December 31, 2019 |  | 5,405,669 |  | $ | 8.20 |  | 2.40
Unvested restricted stock awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedules of restricted stock and restricted stock unit activity |
|  |  |  | Weighted Average
|  |  |  | Grant Date Fair
|  | Number of Shares |  | Value
Nonvested at December 31, 2017 |  | 180,000 |  | $ | 5.73
Granted |  | 322,636 |  |  | 5.78
Nonvested at December 31, 2018 |  | 502,636 |  | $ | 5.76
Granted |  | 119,060 |  |  | 3.83
Vested |  | — |  |  | —
Forfeited |  | (322,636) |  |  | 5.14
Nonvested at December 31, 2019 |  | 299,060 |  | $ | 5.66
Unvested restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedules of restricted stock and restricted stock unit activity |
|  |  |  | Weighted Average
|  |  |  | Grant Date Fair
|  | Number of Units |  | Value
Nonvested at December 31, 2017 |  | 134,000 |  | $ | 6.53
Granted |  | 1,072,000 |  |  | 8.16
Vested |  | (173,916) |  |  | 9.25
Nonvested at December 31, 2018 |  | 1,032,084 |  | $ | 7.77
Granted |  | 625,000 |  |  | 3.01
Forfeited |  | (344,750) |  |  | 7.67
Vested |  | (199,917) |  |  | 7.81
Nonvested at December 31, 2019 |  | 1,112,417 |  | $ | 5.11

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