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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Proceeds from stock issued in connection with the employee stock purchase plan | $ 7,307 | $ 8,579 |
Employee stock purchase plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for issuance (in shares) | 5,721,517 |  | 1,478,808
Common stock purchased (in shares) | 377,378 |  |
Share price (in usd per share) | $ 19.36 |  |
Employee contributions | $ 5,000 |  |
Unrecognized stock-based compensation expense | $ 6,500 |  |
Remaining offering period | 8 months 12 days |  |

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