Income Taxes - Provision and Components of Net Loss (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Income tax benefit	$ 0	$ (1,305,000)	$ 691,000
Domestic and foreign components of net loss
Domestic	(125,797,000)	(71,073,000)	(72,271,000)
Foreign	246,000	6,228,000	(5,607,000)
Loss before income tax (expense) benefit	$ (125,551,000)	$ (64,845,000)	$ (77,878,000)