Marketable Securities - Continuous loss position (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value
Less Than 12 Months	$ 47,599	$ 43,070
12 Months or Longer	0	0
Total	47,599	43,070
Unrealized Losses
Less Than 12 Months	(464)	(116)
12 Months or Longer	0	0
Total	(464)	(116)
Corporate debt securities
Fair Value
Less Than 12 Months	732	737
12 Months or Longer	0	0
Total	732	737
Unrealized Losses
Less Than 12 Months	(3)	(2)
12 Months or Longer	0	0
Total	(3)	(2)
U.S. treasury and agency securities
Fair Value
Less Than 12 Months	39,649	31,809
12 Months or Longer	0	0
Total	39,649	31,809
Unrealized Losses
Less Than 12 Months	(439)	(104)
12 Months or Longer	0	0
Total	(439)	(104)
Commercial paper
Fair Value
Less Than 12 Months	1,006	1,808
12 Months or Longer	0	0
Total	1,006	1,808
Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	0	0
Total	0	0
Asset backed securities
Fair Value
Less Than 12 Months	6,212	8,716
12 Months or Longer	0	0
Total	6,212	8,716
Unrealized Losses
Less Than 12 Months	(22)	(10)
12 Months or Longer	0	0
Total	$ (22)	$ (10)