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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments (Excluding Restricted Cash) Measured at Fair Value on Recurring Basis | The following tables set forth the Company’s financial instruments (excluding restricted cash) that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):
|  | December 31, 2020 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Money market funds |  | $ | 146,468 |  |  | $ | 146,468 |  |  | $ | - |  |  | $ | - |
U.S. treasury securities |  |  | 301,112 |  |  |  | - |  |  |  | 301,112 |  |  |  | - |
U.S. government agency obligations |  |  | 25,001 |  |  |  | - |  |  |  | 25,001 |  |  |  | - |
Corporate securities and commercial paper |  |  | 262,505 |  |  |  | - |  |  |  | 262,505 |  |  |  | - |
Total assets measured at fair value |  | $ | 735,086 |  |  | $ | 146,468 |  |  | $ | 588,618 |  |  | $ | - |
|  | December 31, 2019 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Money market funds |  | $ | 45,498 |  |  | $ | 45,498 |  |  | $ | - |  |  | $ | - |
U.S. treasury securities |  |  | 74,854 |  |  |  | - |  |  |  | 74,854 |  |  |  | - |
Corporate securities and commercial paper |  |  | 67,918 |  |  |  | - |  |  |  | 67,918 |  |  |  | - |
Total assets measured at fair value |  | $ | 188,270 |  |  | $ | 45,498 |  |  | $ | 142,772 |  |  | $ | - |
Schedule of Investments Classified as Available for Sale Securities with Contractual Maturities | Classified as (with contractual maturities):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Cash and cash equivalents |  | $ | 173,415 |  |  | $ | 57,937 |
Short-term investments (due within one year) |  |  | 555,231 |  |  |  | 130,333 |
Long-term investments (due between one and two years) |  |  | 6,440 |  |  |  | - |
|  | $ | 735,086 |  |  | $ | 188,270 |
Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities by Major Security Type | The fair value and amortized cost of investments in marketable securities by major security type as of December 31, 2020 and 2019 are presented in the tables that follow (in thousands):
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |
As of December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 146,468 |  |  | $ | - |  |  | $ | - |  |  | $ | 146,468 |
U.S. treasury securities |  |  | 301,075 |  |  |  | 38 |  |  |  | (1 | ) |  |  | 301,112 |
U.S. government agency obligations |  |  | 24,997 |  |  |  | 4 |  |  |  | - |  |  |  | 25,001 |
Corporate securities and commercial paper |  |  | 262,502 |  |  |  | 15 |  |  |  | (12 | ) |  |  | 262,505 |
Total |  | $ | 735,042 |  |  | $ | 57 |  |  | $ | (13 | ) |  | $ | 735,086 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |
As of December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 45,498 |  |  | $ | - |  |  | $ | - |  |  | $ | 45,498 |
U.S. treasury securities |  |  | 74,801 |  |  |  | 12 |  |  |  | (1 | ) |  |  | 74,812 |
Corporate securities and commercial paper |  |  | 67,907 |  |  |  | 55 |  |  |  | (2 | ) |  |  | 67,960 |
Total |  | $ | 188,206 |  |  | $ | 67 |  |  | $ | (3 | ) |  | $ | 188,270 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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