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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total available-for-sale securities
Amortized Cost	$ 115,219	$ 48,205
Gross Unrealized Gains	38
Gross Unrealized Losses	(5)	(16)
Estimated Fair Value	115,252	48,189
Available-for-sale securities in a loss position
Estimated Fair Value	28,945	45,700
Gross Unrealized Losses	(5)	(16)
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	105,096	37,191
Gross Unrealized Gains	38
Gross Unrealized Losses	(4)	(7)
Estimated Fair Value	105,130	37,184
Available-for-sale securities in a loss position
Estimated Fair Value	22,943	37,184
Gross Unrealized Losses	(4)	(7)
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	6,003	8,525
Gross Unrealized Losses	(1)	(9)
Estimated Fair Value	6,002	8,516
Available-for-sale securities in a loss position
Estimated Fair Value	6,002	8,516
Gross Unrealized Losses	(1)	(9)
Commercial paper
Total available-for-sale securities
Amortized Cost	2,981	2,489
Estimated Fair Value	$ 2,981	$ 2,489

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