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Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 148,941	$ 138,832
Gross Unrealized Gains	35	222
Gross Unrealized Losses	(13)	(9)
Fair Value	$ 148,963	$ 139,045
Minimum
Debt and Equity Securities, FV-NI [Line Items]
Remaining maturity	1 month	3 months
Maximum
Debt and Equity Securities, FV-NI [Line Items]
Remaining maturity	16 months	2 years
U.S. Government Agencies
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 83,596	$ 36,880
Gross Unrealized Gains	3	99
Gross Unrealized Losses	(12)	0
Fair Value	83,587	36,979
Corporate Bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	24,162	60,803
Gross Unrealized Gains	31	77
Gross Unrealized Losses	(1)	(2)
Fair Value	24,192	60,878
Commercial Paper
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	34,766	19,965
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	34,766	19,966
Agency Bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	3,998	12,198
Gross Unrealized Gains	1	44
Gross Unrealized Losses	0	0
Fair Value	3,999	12,242
Asset-backed Securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	2,419	8,986
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(7)
Fair Value	$ 2,419	$ 8,980

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