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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Summary of Significant Accounting Policies [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis September 30, 2021 December 31, 2020(in thousands)Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 TotalAssets Cash and cash equivalents: Cash and money market funds $ 364,020 $ — $ — $ 364,020 $ 43,040  $ — $ — $ 43,040 Commercial paper — 61,368  — 61,368  — 32,537  — 32,537 U.S. government & agency securities — — — — — 170  — 170 U.S. Treasury security — — — — — 5,864  — 5,864 Total cash and cash equivalents 364,020 61,368  — 425,388 43,040  38,571  — 81,611 Investments: Commercial paper — 255,817  — 255,817  — 112,644  — 112,644 Corporate debt securities — 13,595  — 13,595  — 17,456  — 17,456 U.S. government & agency securities — 385,090  — 385,090  — 107,103  — 107,103 Total investments — 654,502  — 654,502  — 237,203  — 237,203 Short-term restricted cash: Cash 500 — — 500 836  — — 836 Long-term restricted cash: Cash 4,560 — — 4,560 3,500  — — 3,500 Total assets measured at fair value $ 369,080 $ 715,870  $ — $ 1,084,950 $ 47,376  $ 275,774  $ — $ 323,150  Liabilities Continuation Advances $ — $ — $ — $ — $ — $ — $ — $ —Contingent consideration — — 168,574  168,574  — — — —Total liabilities measured at fair value $ — $ — $ 168,574  $ 168,574  $ — $ — $ — $ —
Computation of Basic and Diluted Net Income (Loss) per Share Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020Numerator: Net income (loss) $ 16,542 $ (23,708) $ (111,894) $ (45,532) Denominator: Basic Weighted average shares used in computing net income (loss) per share, basic 202,194 166,862 198,545 158,195Net income (loss) per share, basic $ 0.08 $ (0.14) $ (0.56) $ (0.29) Diluted Weighted average shares used in computing net income (loss) per share, basic 202,194   166,862 198,545   158,195Add: Weighted average stock options 7,754 — — —Add: Weighted average restricted stock units 3,598 — — —Add: Weighted average shares issuable pursuant to ESPP 1,581 — — —Weighted average shares used in computing net income (loss) per share, diluted 215,127 166,862 198,545 158,195Net income (loss) per share, diluted $ 0.08 $ (0.14) $ (0.56) $ (0.29)
Anti-dilutive Shares Excluded from Computation of Diluted Net Income (Loss) per Share Three Months Ended September 30, Nine Months Ended September 30,(in thousands) 2021 2020 2021 2020Shares issuable upon conversion of convertible senior notes 20,690 — 17,203 —Options to purchase common stock 2,326 19,921 12,703 19,921RSUs with time-based vesting 2,006 5,971 6,835 5,971RSUs with performance-based vesting — 94 — 94ESPP shares 126 2,890 1,564 2,890