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Equity Incentive Awards (Tables) | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Summary of Stock Options Activity | The following table summarizes the Company’s option activity and related information:
| Number of Options (in thousands) |  | Weighted- Average Exercise Price
Balance at December 31, 2021 | 13,288 |  |  | $ | 9.34 |
Options granted | 5,735 |  |  | 1.40 |
Options exercised | (15) |  |  | 0.19 |
Options forfeited | (2,837) |  |  | 6.60 |
Balance at March 31, 2022 | 16,171 |  |  | $ | 7.01 |
Exercisable as of March 31, 2022 | 3,921 |  |  | $ | 12.95 |
Summary of Restricted Stock Units Activity | The following table summarizes the Company’s RSUs activity and related information:
| Number of Units (in thousands) |  | Weighted- Average Grant- Date Fair Value
Outstanding at December 31, 2021 | 2,126 |  |  | $ | 3.76 |
Granted | 858 |  |  | 1.43 |
Vested and released | (371) |  |  | 4.62 |
Forfeited | (91) |  |  | 3.83 |
Outstanding at March 31, 2022 | 2,522 |  |  | $ | 2.84 |
Stock-Based Compensation Expense | The following table presents, by operating expense, the Company’s stock-based compensation expense:
| Three Months Ended March 31, |  |
| 2022 |  | 2021 |  |  |  |
| (In thousands)
Research and development | $ | 1,933 |  |  | $ | 2,339 |  |  |  |  |
General and administrative | 3,448 |  |  | 4,885 |  |  |  |  |
Total stock-based compensation expense | $ | 5,381 |  |  | $ | 7,224 |  |  |  |  |

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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=120381028&loc=d3e5070-113901 + Details
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