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Common Stock (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Vote shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Jul. 31, 2015 shares
Common Stock, Capital Shares Reserved for Future Issuance | 12,030,284 | 10,433,255 |  |
Common Stock |  |  |  |
Voting rights per share | Vote | 1 |  |  |
Dividends, Common Stock | $ | $ 0 | $ 0 | $ 0 |
Stock options | Common Stock |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 280,000 | 175,000 |  |
2013 Plan |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 6,317,769
2013 Plan | Stock options | Common Stock |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 174,362 | 312,342 |  |
2015 Plan | Common Stock |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 5,599,450 | 4,061,357 |  |
2015 Plan | Stock options | Common Stock |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 3,839,345 | 4,254,357 |  |
2015 Employee Stock Purchase Plan |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,137,127 | 1,630,199 |  |

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