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Investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 113,115	$ 148,941
Gross Unrealized Gains	21	35
Gross Unrealized Losses	(7)	(13)
Fair Value	$ 113,129	$ 148,963
Minimum
Debt and Equity Securities, FV-NI [Line Items]
Remaining maturity	1 month	1 month
Maximum
Debt and Equity Securities, FV-NI [Line Items]
Remaining maturity	13 months	19 months
U.S. Government Agencies
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 55,388	$ 83,596
Gross Unrealized Gains	5	3
Gross Unrealized Losses	0	(12)
Fair Value	55,393	83,587
Commercial Paper
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	27,676	34,766
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	27,676	34,766
Corporate Bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	27,648	24,162
Gross Unrealized Gains	16	31
Gross Unrealized Losses	(7)	(1)
Fair Value	27,657	24,192
Agency Bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost		3,998
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		3,999
Asset-backed Securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	2,403	2,419
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 2,403	$ 2,419

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