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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Summary of Significant Accounting Policies [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis |
| June 30, 2021 |  | December 31, 2020
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 263,433 |  | $ | — |  | $ | — |  | $ | 263,433 |  | $ | 43,040 |  | $ | — |  | $ | — |  | $ | 43,040
Commercial paper |  | — |  |  | 193,085 |  |  | — |  |  | 193,085 |  |  | — |  |  | 32,537 |  |  | — |  |  | 32,537
U.S. government & agency securities |  | — |  |  | 3,276 |  |  | — |  |  | 3,276 |  |  | — |  |  | 170 |  |  | — |  |  | 170
U.S. Treasury security |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,864 |  |  | — |  |  | 5,864
Total cash and cash equivalents |  | 263,433 |  |  | 196,361 |  |  | — |  |  | 459,794 |  |  | 43,040 |  |  | 38,571 |  |  | — |  |  | 81,611
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | — |  |  | 173,946 |  |  | — |  |  | 173,946 |  |  | — |  |  | 112,644 |  |  | — |  |  | 112,644
Corporate debt securities |  | — |  |  | 13,681 |  |  | — |  |  | 13,681 |  |  | — |  |  | 17,456 |  |  | — |  |  | 17,456
U.S. government & agency securities |  | — |  |  | 496,952 |  |  | — |  |  | 496,952 |  |  | — |  |  | 107,103 |  |  | — |  |  | 107,103
Total investments |  | — |  |  | 684,579 |  |  | — |  |  | 684,579 |  |  | — |  |  | 237,203 |  |  | — |  |  | 237,203
Short-term restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 300 |  |  | — |  |  | — |  |  | 300 |  |  | 836 |  |  | — |  |  | — |  |  | 836
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 3,000 |  |  | — |  |  | — |  |  | 3,000 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
Total assets measured at fair value | $ | 266,733 |  | $ | 880,940 |  | $ | — |  | $ | 1,147,673 |  | $ | 47,376 |  | $ | 275,774 |  | $ | — |  | $ | 323,150
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuation Advances | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Total liabilities measured at fair value | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Anti-dilutive Shares Excluded from Computation of Diluted Net Income (Loss) per Share |
|  | Six Months Ended June 30,
(in thousands) |  | 2021 |  | 2020
Shares issuable upon conversion of convertible senior notes |  | 20,690 |  | —
Options to purchase common stock |  | 12,335 |  | 20,485
RSUs with time-based vesting |  | 6,820 |  | 5,109
RSUs with performance-based vesting |  | — |  | 138
ESPP shares |  | 2,336 |  | 3,635

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