Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
NOL carryforwards	$ 40,386	$ 30,540
Tax credit carryforwards	1,204	4,346
Employee compensation	1,478	187
Accruals and reserves	1,743	543
Organizational costs	179	194
Transaction costs	324	0
Deferred tax assets, gross	45,314	35,810
Valuation allowance	(43,895)	(34,773)
Total deferred tax assets, net	1,419	1,037
Deferred tax liabilities:
Fixed assets	(1,358)	(1,010)
Investment in partnership	(61)	(27)
Deferred tax liabilities	(1,419)	(1,037)
Total deferred tax asset (liability)	$ 0	$ 0