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Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable SecuritiesThe following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2020, which all have contractual maturities of less than two years:
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
U.S. Treasury and government agencies | $ | 165,966 |  |  | $ | 129 |  |  | $ | (3) |  |  | $ | 166,092 |
Corporate debt | 140,538 |  |  | 87 |  |  | (8) |  |  | 140,617 |
Total marketable securities | $ | 306,504 |  |  | $ | 216 |  |  | $ | (11) |  |  | $ | 306,709 |
The following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2019, which all have contractual maturities of less than two years:
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
U.S. Treasury and government agencies | $ | 88,535 |  |  | $ | 68 |  |  | $ | (2) |  |  | $ | 88,601 |
Corporate debt | 129,860 |  |  | 196 |  |  | (1) |  |  | 130,055 |
Asset-backed securities | 48,355 |  |  | 49 |  |  | (3) |  |  | 48,401 |
Total marketable securities | $ | 266,750 |  |  | $ | 313 |  |  | $ | (6) |  |  | $ | 267,057 |

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