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Stockholders' Equity (Details) - shares | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Common Stock |  |
Options issued and outstanding (in shares) | 5,988,461 | 5,562,484
Total number of shares reserved for issuance (in shares) | 9,300,887 | 7,690,456
Shares of common stock subject to outstanding options |  |
Common Stock |  |
Shares available for issuance (in shares) | 3,200,200 | 1,954,804
ESPP (in shares) |  |
Common Stock |  |
Shares available for issuance (in shares) | 112,226 | 173,168

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