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Stock-based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Options Outstanding | 1,320,197 |
Options granted | 637,213 |
Options exercised | (85,559) |
Options forfeited | (150,730) |
Options cancelled | 0 |
Options Outstanding | 1,721,121 | 1,320,197
Options Vested and expected to vest at September 30, 2019 | 1,721,121 |
Options Vested at September 30, 2019 | 1,139,418 |
Outstanding, Weighted average exercise price per share | $ / shares | $ 0.77 |
Options granted, Weighted average exercise price per share | $ / shares | 10.94 |
Options exercised, Weighted average exercise price per share | $ / shares | 0.81 |
Options forfeited, Weighted average exercise price per share | $ / shares | 6.64 |
Outstanding, Weighted average exercise price per share | $ / shares | 4.02 | $ 0.77
Vested and expected to vest at September 30, 2019, Weighted average exercise price per share | $ / shares | 4.02 |
Vested at September 30, 2019, Weighted average exercise price per share | $ / shares | $ 2.72 |
Outstanding, Weighted average remaining contractual life (in years) | 7 years 11 months 4 days | 7 years 11 months 26 days
Vested and expected to vest at September 30, 2019, Weighted average remaining contractual life (in years) | 7 years 11 months 4 days |
Vested at September 30, 2019, Weighted average remaining contractual life (in years) | 7 years 3 months 29 days |
Outstanding, Aggregate Intrinsic Value | $ | $ 2,541 | $ 8,465
Vested and expected to vest at September 30, 2019, Aggregate Intrinsic Value | $ | 2,541 |
Vested at September 30, 2019, Aggregate Intrinsic Value | $ | $ 1,993 |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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