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Fair Value Measurement - Financial Instruments at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Short-term investments | $ 381,074 | $ 93,345
Fair Value on Recurring Basis |  |
Assets: |  |
Total assets measured and recorded at fair value | 837,722 | 132,716
Fair Value on Recurring Basis | Agency Securities |  |
Assets: |  |
Short-term investments | 10,006 |
Long-term investments | 15,005 |
Fair Value on Recurring Basis | US Treasury Securities |  |
Assets: |  |
Short-term investments | 44,286 | 14,328
Long-term investments |  | 1,628
Fair Value on Recurring Basis | Corporate Bond Securities |  |
Assets: |  |
Short-term investments | 319,293 | 38,529
Long-term investments | 295,478 | 14,424
Fair Value on Recurring Basis | Commercial paper |  |
Assets: |  |
Short-term investments | 7,489 | 40,488
Fair Value on Recurring Basis | Commercial paper |  |
Assets: |  |
Cash equivalents |  | 18,267
Fair Value on Recurring Basis | Money Market Funds |  |
Assets: |  |
Cash equivalents | 146,165 | 5,052
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets measured and recorded at fair value | 190,451 | 21,008
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency Securities |  |
Assets: |  |
Short-term investments | 0 |
Long-term investments | 0 |
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities |  |
Assets: |  |
Short-term investments | 44,286 | 14,328
Long-term investments |  | 1,628
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bond Securities |  |
Assets: |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper |  |
Assets: |  |
Short-term investments | 0 | 0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper |  |
Assets: |  |
Cash equivalents |  | 0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds |  |
Assets: |  |
Cash equivalents | 146,165 | 5,052
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total assets measured and recorded at fair value | 647,271 | 111,708
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Agency Securities |  |
Assets: |  |
Short-term investments | 10,006 |
Long-term investments | 15,005 |
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | US Treasury Securities |  |
Assets: |  |
Short-term investments | 0 | 0
Long-term investments |  | 0
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate Bond Securities |  |
Assets: |  |
Short-term investments | 319,293 | 38,529
Long-term investments | 295,478 | 14,424
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Short-term investments | 7,489 | 40,488
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Cash equivalents |  | 18,267
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Money Market Funds |  |
Assets: |  |
Cash equivalents | $ 0 | $ 0

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