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Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Marketable securities:
Amortized Cost Basis	$ 103,754
Unrealized Gains	492
Fair Value	104,246	$ 162,942
US Government
Marketable securities:
Amortized Cost Basis	42,204
Unrealized Gains	347
Fair Value	42,551
Corporate Bonds
Marketable securities:
Amortized Cost Basis	36,939
Unrealized Gains	141
Fair Value	37,080
Commercial Paper
Marketable securities:
Amortized Cost Basis	19,692
Unrealized Gains	4
Fair Value	19,696
Money Market Funds
Marketable securities:
Amortized Cost Basis	3,288
Fair Value	3,288
Certificates of Deposit
Marketable securities:
Amortized Cost Basis	1,631
Fair Value	$ 1,631

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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