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Stock Option Plan - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Outstanding, December 31, 2018 (in Shares) | 661,180 |
Granted (in Shares) | 814,339 |
Exercised (in Shares) | (50) |
Forfeited (in Shares) | (310) |
Expired (in Shares) | (153) |
Outstanding, September 30, 2019 (in Shares) | 1,475,006 | 661,180
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Outstanding, December 31, 2018, Weighted Average Exercise Price (in dollars per share) | $ 1.22 |
Granted, Weighted Average Exercise Price (in dollars per share) | 13.99 |
Exercised, Weighted Average Exercise Price (in dollars per share) | 1.84 |
Forfeited, Weighted Average Exercise Price (in dollars per share) | 5.75 |
Expired, Weighted Average Exercise Price (in dollars per share) | 37.20 |
Outstanding, September 30, 2019, Weighted Average Exercise Price (in dollars per share) | $ 8.26 | $ 1.22
Stock Options, Additional Disclosures [Abstract] |  |
Outstanding, Weighted Average Remaining Contractual Term | 8 years 10 months 20 days | 9 years 6 months 7 days
Vested and expected to vest, Weighted Average Remaining Contractual Term | 8 years 10 months 20 days |
Options exercisable, Weighted Average Remaining Contractual Term | 4 years 6 months 21 days |
Outstanding, Aggregate Intrinsic Value | $ 10,993 | $ 6,198
Vested and expected to vest, Aggregate Intrinsic Value | 10,993 |
Options exercisable, Aggregate Intrinsic Value | $ 23 |
Vested and expected to vest, September 30, 2019 (in Shares) | 1,475,006 |
Vested and expected to vest, September 30, 2019, Weighted Average Exercise Price (in dollars per share) | $ 8.26 |
Options exercisable, September 30, 2019 (in Shares) | 20,464 |
Options exercised, September 30, 2019, Weighted Average Exercise Price (in dollars per share) | $ 30.74 |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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