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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 Securities Available-for-sale marketable securities as of December 31, 2020 and 2019 were as follows (in thousands):
| December 31, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 60,630 |  |  | $ | 1 |  |  | $ | (7) |  |  | $ | 60,624 |
Corporate debt securities | 30,777 |  |  | 2 |  |  | (3) |  |  | 30,776 |
Total | $ | 91,407 |  |  | $ | 3 |  |  | $ | (10) |  |  | $ | 91,400 |
| December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government-sponsored enterprises | $ | 13,216 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 13,222 |
Corporate debt securities | 76,052 |  |  | 20 |  |  | (10) |  |  | 76,062 |
Total | $ | 89,268 |  |  | $ | 26 |  |  | $ | (10) |  |  | $ | 89,284 |
All of the Company's available-for-sale securities held at December 31, 2020 and 2019 had contractual maturities of less than one year. All of the Company’s available-for-sale marketable debt securities in an unrealized loss position as of December 31, 2020 and 2019 were in a loss position for less than twelve months. Unrealized losses on available-for-sale debt securities as of December 31, 2020 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, no allowance for credit losses related to the Company's available-for-sale debt securities was recorded for the year ended December 31, 2020. The Company does not intend to sell these investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. No losses related to other-than-temporary impairments of the Company’s available-for-sale debt securities were recorded in Accumulated other comprehensive income during the year ended December 31, 2019. The Company recorded interest income of $0.8 million, $3.4 million and $2.3 million during the years ended December 31, 2020, 2019 and 2018, respectively, which is included in Other income (expense) on the consolidated statements of operations and comprehensive loss.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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