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Stock-Based Awards (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following tables summarize the Company’s stock option activity since December 31, 2018 and through September 30, 2019:
|  | Shares |  |  | Weighted |  |  | Average |  |  |  |
|  | Issuable |  |  | Average |  |  | Remaining |  | Aggregate |
|  | Under |  |  | Exercise |  |  | Contractual |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  | Value |
|  |  |  |  |  |  |  |  |  | (in years) |  | (in thousands) |
Outstanding as of December 31, 2018 |  |  | 5,024,371 |  |  | $ | 8.85 |  |  | 7.6 |  | $ | 3,143 |
Granted |  |  | 2,276,197 |  |  | $ | 4.00 |  |  |  |  |  |  |
Exercised |  |  | (10,667 | ) |  | $ | 0.75 |  |  |  |  |  |  |
Forfeited |  |  | (2,171,621 | ) |  | $ | 7.60 |  |  |  |  |  |  |
Outstanding as of September 30, 2019 |  |  | 5,118,280 |  |  | $ | 7.24 |  |  | 6.4 |  | $ | — |
Options exercisable as of September 30, 2019 |  |  | 2,701,812 |  |  | $ | 9.53 |  |  | 4.2 |  | $ | — |
Summary of Stock-Based Compensation Expense Related to Stock Options, Restricted Common Stock and ESPP | The Company recorded stock-based compensation expense related to stock options, restricted common stock and the ESPP in the following expense categories within its condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018 as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Research and development |  | $ | (359 | ) |  | $ | 1,027 |  |  | $ | 1,337 |  |  | $ | 4,263 |
General and administrative |  |  | 963 |  |  |  | 1,173 |  |  |  | 3,218 |  |  |  | 3,074 |
|  | $ | 604 |  |  | $ | 2,200 |  |  | $ | 4,555 |  |  | $ | 7,337 |

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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=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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&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=116856206&loc=d3e5047-113901 + 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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