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Stock-based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Options Outstanding at January 1, 2019 | 1,320,197 |
Options granted | 637,213 |
Options exercised | (72,034) |
Options forfeited | (66,084) |
Options cancelled | 0 |
Options Outstanding at June 30, 2019 | 1,819,292 | 1,320,197
Outstanding at January, 1, 2019, 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 | 0.77 |
Options forfeited, Weighted average exercise price per share | $ / shares | 1.53 |
Outstanding at June 30, 2019, Weighted average exercise price per share | $ / shares | $ 4.30 | $ 0.77
Outstanding, Weighted average remaining contractual life (in years) | 8 years 2 months 26 days | 7 years 11 months 26 days
Outstanding, Aggregate Intrinsic Value | $ | $ 15,331 | $ 8,465
Options Vested and expected to vest | 1,819,292 |
Options Vested | 1,115,256 |
Vested and expected to vest, Weighted average exercise price per share | $ / shares | $ 4.30 |
Vested, Weighted average exercise price per share | $ / shares | $ 2.84 |
Vested and expected to vest, Weighted average remaining contractual life (in years) | 8 years 2 months 26 days |
Vested, Weighted average remaining contractual life (in years) | 7 years 6 months 29 days |
Vested and expected to vest, Aggregate Intrinsic Value | $ | $ 15,331 |
Vested, Aggregate Intrinsic Value | $ | $ 11,026 |

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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=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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