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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis and Level of Inputs used in such Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Cash and cash equivalents, Adjusted Cost | $ 133,245 | $ 55,046
Fair Value Measurements Recurring |  |
Assets |  |
Cash and cash equivalents, Adjusted Cost | 133,246 | 55,047
Cash and cash equivalents, Unrealized Losses | (1) | (1)
Cash and cash equivalents, Fair Value | 133,245 | 55,046
Assets, Adjusted Cost | 206,012 | 128,283
Assets, Unrealized Gains | 56 | 21
Assets, Unrealized Losses | (5) | (15)
Assets, Fair Value | 206,063 | 128,289
Fair Value Measurements Recurring | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost | 72,766 | 73,236
Investments, Unrealized Gains | 56 | 21
Investments, Unrealized Losses | (4) | (14)
Investments, Fair Value | 72,818 | 73,243
Fair Value Measurements Recurring | Cash |  |
Assets |  |
Cash and cash equivalents, Adjusted Cost | 2,494 | 1,271
Cash and cash equivalents, Fair Value | 2,494 | 1,271
Fair Value Measurements Recurring | Level 1 | Money Market Funds |  |
Assets |  |
Cash and cash equivalents, Adjusted Cost | 102,532 | 12,495
Cash and cash equivalents, Fair Value | 102,532 | 12,495
Fair Value Measurements Recurring | Level 2 | Commercial Paper |  |
Assets |  |
Cash and cash equivalents, Adjusted Cost | 26,520 | 41,281
Cash and cash equivalents, Unrealized Losses | (1) | (1)
Cash and cash equivalents, Fair Value | 26,519 | 41,280
Fair Value Measurements Recurring | Level 2 | Commercial Paper | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost | 3,899 | 17,898
Investments, Unrealized Losses |  | (6)
Investments, Fair Value | 3,899 | 17,892
Fair Value Measurements Recurring | Level 2 | U.S. Agency Securities |  |
Assets |  |
Cash and cash equivalents, Adjusted Cost | 1,700 |
Cash and cash equivalents, Fair Value | 1,700 |
Fair Value Measurements Recurring | Level 2 | U.S. Agency Securities | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost | 60,895 | 32,776
Investments, Unrealized Gains | 47 | 20
Investments, Unrealized Losses | (4) | (2)
Investments, Fair Value | 60,938 | 32,794
Fair Value Measurements Recurring | Level 2 | Corporate Debt Securities | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost | 7,972 | 13,953
Investments, Unrealized Gains | 9 | 1
Investments, Unrealized Losses |  | (6)
Investments, Fair Value | $ 7,981 | 13,948
Fair Value Measurements Recurring | Level 2 | U.S. Government Securities | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost |  | 4,011
Investments, Fair Value |  | 4,011
Fair Value Measurements Recurring | Level 2 | Asset-backed Securities | Short-term Investments |  |
Assets |  |
Investments, Adjusted Cost |  | 4,598
Investments, Fair Value |  | $ 4,598

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