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Cash and Cash Equivalents and Short-Term Investments - Summary of Amortized Cost, Unrealized Gain and Loss and Estimated Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 105,485 | $ 137,854
Unrealized Gain | 149 | 52
Unrealized Loss | 0 | (2)
Estimated Fair Value | 105,634 | 137,904
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 48,573 | 61,371
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 48,573 | 61,371
Corporate bonds |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 11,769 | 23,856
Unrealized Gain | 56 | 14
Unrealized Loss | 0 | (1)
Estimated Fair Value | 11,825 | 23,869
U.S. Treasury and agency obligations |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 45,143 | 52,627
Unrealized Gain | 93 | 38
Unrealized Loss | 0 | (1)
Estimated Fair Value | 45,236 | 52,664
Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 55,178 | 13,588
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents |  | 8,987
Cash equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | $ 55,178 | $ 22,575

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