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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Summary of Significant Accounting Policies [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis |
| September 30, 2020 |  | December 31, 2019
(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 | $ | 41,784 |  | $ | — |  | $ | — |  | $ | 41,784 |  | $ | 18,644 |  | $ | — |  | $ | — |  | $ | 18,644
Commercial paper |  | — |  |  | 24,244 |  |  | — |  |  | 24,244 |  |  | — |  |  | 10,983 |  |  | — |  |  | 10,983
U.S. Treasury security |  | — |  |  | 3,000 |  |  | — |  |  | 3,000 |  |  | — |  |  | — |  |  | — |  |  | —
Total cash and cash equivalents |  | 41,784 |  |  | 27,244 |  |  | — |  |  | 69,028 |  |  | 18,644 |  |  | 10,983 |  |  | — |  |  | 29,627
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | — |  |  | 105,380 |  |  | — |  |  | 105,380 |  |  | — |  |  | 16,971 |  |  | — |  |  | 16,971
Corporate debt securities |  | — |  |  | 21,195 |  |  | — |  |  | 21,195 |  |  | — |  |  | 2,501 |  |  | — |  |  | 2,501
U.S. government & agency securities |  | — |  |  | 10,097 |  |  | — |  |  | 10,097 |  |  | — |  |  | — |  |  | — |  |  | —
U.S. Treasury security |  | — |  |  | 2,850 |  |  | — |  |  | 2,850 |  |  | — |  |  | — |  |  | — |  |  | —
Total investments |  | — |  |  | 139,522 |  |  | — |  |  | 139,522 |  |  | — |  |  | 19,472 |  |  | — |  |  | 19,472
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 4,000 |  |  | — |  |  | — |  |  | 4,000
Total assets measured at fair value | $ | 45,284 |  | $ | 166,766 |  | $ | — |  | $ | 212,050 |  | $ | 22,644 |  | $ | 30,455 |  | $ | — |  | $ | 53,099
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Derivative | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Continuation Advances |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Total liabilities measured at fair value | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Anti-dilutive Shares Excluded from Computation of Diluted Net Income (Loss) per Share |
|  | Nine Months Ended September 30,
(in thousands) |  | 2020 |  | 2019
Options to purchase common stock |  | 19,921 |  | 23,048
RSUs with time-based vesting |  | 5,971 |  | 1,094
RSUs with performance-based vesting |  | 94 |  | 138
Schedule of Cumulative Effect on Consolidated Balance Sheet for Adoption of ASU 2016-13 |
Balance Sheets | Balance at December 31, 2019 |  | Adjustments Due to Topic 326 |  | Balance at January 1, 2020
Assets |  |  |  |  |  |  |  |
Accounts receivable | $ | 15,266 |  | $ | (32) |  | $ | 15,234
Liabilities and Stockholders' Equity |  |  |  |  |  |  |  |
Accumulated deficit |  | (1,066,240) |  |  | (32) |  |  | (1,066,272)

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