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Marketable Securities | 9 Months Ended
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Sep. 30, 2020
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | 7. Marketable Securities The amortized cost, gross unrealized holding losses and fair value of available-for-sale debt securities by type of security as of September 30, 2020 were as follows:
|  | As of September 30, 2020 |
|  | Amortized Cost |  |  | Gross Unrealized Holding Gains |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |
U.S. Government-related obligations |  | $ | 312,476 |  |  | $ | 122 |  |  | $ | — |  |  | $ | 312,598 |
All available-for-sale securities mature in one year or less. The Company did not hold available-for-sale securities as of December 31, 2019.

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