Summary of Significant Accounting Policies - Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Research and development incentive income and receivable
Research and development expenses reimbursed (as a percent)	43.50%	43.50%
Research and development incentive income and receivable
Balance at the beginning of the period	$ 1,189	$ 73	$ 73
Australian research and development incentive income, net	37	$ 71	(1,226)
Cash received for eligible expenses			(111)
Foreign currency translation	45		1
Balance at the end of the period	1,271		1,189
Other Assets
Deposits with service providers that are to be applied to future payments	$ 293		$ 293
Incremental borrowing rate	8.00%