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Equity Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock-Based Compensation Expense Recognized | Stock-based compensation expense recognized for stock options, restricted stock units ("RSUs"), performance-based restricted stock units ("PRSUs") and our employee stock purchase program (the "ESPP") are recorded as operating expenses in our condensed statements of operations and comprehensive loss, as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | $ | 1,087 |  |  | $ | 1,144 |  |  | $ | 2,179 |  |  | $ | 2,202 |
General and administrative | 2,132 |  |  | 1,530 |  |  | 4,127 |  |  | 3,420 |
Total | $ | 3,219 |  |  | $ | 2,674 |  |  | $ | 6,306 |  |  | $ | 5,622 |
Summary of Total Unrecognized Stock-Based Compensation Expense, Net of Estimated Forfeitures | As of June 30, 2021, our total unrecognized stock-based compensation expense, net of estimated forfeitures, and average remaining vesting period, included the following (dollars in thousands):
| Unrecognized Compensation Expense |  | Average Remaining Vesting Period (Years)
Stock options | $ | 25,267 |  |  | 2.8
RSUs | $ | 6,978 |  |  | 3.6
ESPP | $ | 151 |  |  | 0.2
Schedule of Stock Option Activity | A summary of our stock option activity and related information for the six months ended June 30, 2021 is as follows (in thousands, except dollar amounts):
| Number of Shares |  | Weighted Average Exercise Price
Outstanding balance at December 31, 2020 | 9,790 |  |  | $ | 6.76 |
Granted | 3,328 |  |  | $ | 6.62 |
Exercised | (205) |  |  | $ | 2.75 |
Forfeited | (401) |  |  | $ | 7.56 |
Outstanding balance at June 30, 2021 | 12,511 |  |  | $ | 6.76 |
Exercisable at June 30, 2021 | 6,043 |  |  | $ | 7.38 |
Schedule of Restricted Stock Units Activity | A summary of our RSUs activity and related information for the six months ended June 30, 2021 is as follows (in thousands, except dollar amounts):
| Number of RSUs |  | Weighted Average Value at Grant
Outstanding balance at December 31, 2020 | 159 |  |  | $ | 5.64 |
Granted | 1,088 |  |  | $ | 6.62 |
Vested | (80) |  |  | $ | 6.43 |
Forfeited | (32) |  |  | $ | 6.10 |
Unvested at June 30, 2021 | 1,135 |  |  | $ | 6.52 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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