Marketable Securities - Continuous loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Less Than 12 Months	$ 43,070	$ 4,435
12 Months or Longer	0	0
Total	43,070	4,435
Unrealized Losses
Less Than 12 Months	(116)	0
12 Months or Longer	0	0
Total	(116)	0
Corporate debt securities
Fair Value
Less Than 12 Months	737	2,826
12 Months or Longer	0	0
Total	737	2,826
Unrealized Losses
Less Than 12 Months	(2)	0
12 Months or Longer	0	0
Total	(2)	0
U.S. treasury and agency securities
Fair Value
Less Than 12 Months	31,809	1,016
12 Months or Longer	0	0
Total	31,809	1,016
Unrealized Losses
Less Than 12 Months	(104)	0
12 Months or Longer	0	0
Total	(104)	0
Commercial paper
Fair Value
Less Than 12 Months	1,808	0
12 Months or Longer	0	0
Total	1,808	0
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	8,716	593
12 Months or Longer	0	0
Total	8,716	593
Unrealized Losses
Less Than 12 Months	(10)	0
12 Months or Longer	0	0
Total	$ (10)	$ 0