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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Total available-for-sale securities
Amortized Cost	$ 189,791	$ 115,219
Gross Unrealized Gains	15	38
Gross Unrealized Losses	(35)	(5)
Estimated Fair Value	189,771	115,252
Available-for-sale securities in a loss position
Estimated Fair Value	52,545	28,945
Gross Unrealized Losses	(35)	(5)
Investments that had been in a continuous loss position for more than 12 months	0	0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	149,206	105,096
Gross Unrealized Gains	14	38
Gross Unrealized Losses	(1)	(4)
Estimated Fair Value	149,219	105,130
Available-for-sale securities in a loss position
Estimated Fair Value	19,991	22,943
Gross Unrealized Losses	(1)	(4)
Government agency securities
Total available-for-sale securities
Amortized Cost		1,139
Estimated Fair Value		1,139
Corporate debt
Total available-for-sale securities
Amortized Cost	32,588	6,003
Gross Unrealized Losses	(34)	(1)
Estimated Fair Value	32,554	6,002
Available-for-sale securities in a loss position
Estimated Fair Value	32,554	6,002
Gross Unrealized Losses	(34)	(1)
Commercial paper
Total available-for-sale securities
Amortized Cost	7,997	2,981
Gross Unrealized Gains	1
Estimated Fair Value	$ 7,998	$ 2,981

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