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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-Based Compensation |
Schedule of stock option activity under the Company's Equity Incentive Plans |
|  |  |  | Weighted |  |  |  |  |
|  |  |  | Average |  | Weighted |  | Aggregate
|  |  |  | Exercise Price |  | Average Remaining |  | Intrinsic
|  | Options |  | Per Share |  | Life in Years |  | Value
Outstanding at December 31, 2018 |  | 2,761,912 |  | $ | 11.30 |  | 8.01 |  | $ | —
Granted |  | 1,481,975 |  | $ | 1.48 |  |  |  |  |
Forfeited |  | (219,321) |  | $ | 15.14 |  |  |  |  |
Outstanding at December 31, 2019 |  | 4,024,566 |  | $ | 7.48 |  | 7.98 |  | $ | 2
Granted |  | 2,662,500 |  | $ | 2.10 |  |  |  |  |
Exercised |  | (32,778) |  | $ | 1.53 |  |  |  |  |
Forfeited |  | (260,435) |  | $ | 6.95 |  |  |  |  |
Outstanding at December 31, 2020 |  | 6,393,853 |  | $ | 5.29 |  | 7.96 |  | $ | 1,961
Options exercisable at December 31, 2020 |  | 3,482,169 |  | $ | 7.83 |  | 7.07 |  | $ | 722
Options vested and expected to vest at December 31, 2020 |  | 6,393,853 |  | $ | 5.29 |  | 7.96 |  | $ | 1,961
Schedule of assumptions used to determine grant-date fair value of stock options |
|  | Year Ended December 31, |
|  | 2020 |  | 2019 |
Expected volatility |  | 66.94 | % | 66.94 | %
Weighted average risk-free interest rate |  | 0.66 | % | 2.07 | %
Expected dividend yield |  | 0.00 | % | 0.00 | %
Expected term (in years) |  | 6.85 |  | 6.77 |
Schedule of stock-based compensation expense related to issuance of stock option awards recognized in condensed consolidated statements of operations |
|  | Year Ended
|  | December 31,
|  | 2020 |  | 2019
Research and development |  | $ | 1,028 |  | $ | 714
General and administrative |  |  | 1,296 |  |  | 3,018
Total |  | $ | 2,324 |  | $ | 3,732
Summary of outstanding RSU's under the 2016 Plan |
|  |  |  | Weighted
|  | Number of |  | Average
|  | Shares |  | Fair Value
Outstanding at December 31, 2018 |  | — |  | $ | —
Awarded |  | 181,000 |  | $ | 1.74
Settled in cash |  | (90,500) |  | $ | 1.17
Outstanding at December 31, 2019 |  | 90,500 |  | $ | 1.76
Awarded |  | 753,106 |  | $ | 1.49
Settled in cash |  | (90,500) |  | $ | 1.76
Outstanding at December 31, 2020 |  | 753,106 |  | $ | 1.52

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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