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Fair Value Measurements - Summary of Fair Value Measurements of Company's Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Assets: |  |
Assets at fair value | $ 183,998 | $ 244,388
Liabilities: |  |
Derivative liability | 1,259 | 969
Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 93,348 | 147,208
Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 90,650 | 97,180
Level 3 [Member] |  |
Liabilities: |  |
Derivative liability | 1,259 | 969
Derivative Liability Exit Fee [Member] |  |
Liabilities: |  |
Derivative liability | 1,259 | 969
Derivative Liability Exit Fee [Member] | Level 3 [Member] |  |
Liabilities: |  |
Derivative liability | 1,259 | 969
Money Market Funds [Member] |  |
Assets: |  |
Assets at fair value | 83,011 | 147,208
Money Market Funds [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 83,011 | 147,208
Commercial Paper [Member] |  |
Assets: |  |
Assets at fair value | 48,153 | 56,041
Commercial Paper [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 48,153 | 56,041
Corporate Bonds [Member] |  |
Assets: |  |
Assets at fair value | 39,274 | 33,134
Corporate Bonds [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 39,274 | 33,134
U.S. Government-Sponsored Agency Bonds [Member] |  |
Assets: |  |
Assets at fair value | 9,337 |
U.S. Government-Sponsored Agency Bonds [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 9,337 |
Asset-Backed Securities [Member] |  |
Assets: |  |
Assets at fair value | 3,223 | 8,005
Asset-Backed Securities [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 3,223 | $ 8,005
U.S. Treasury Notes [Member] |  |
Assets: |  |
Assets at fair value | 1,000 |
U.S. Treasury Notes [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | $ 1,000 |

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