Fair Value Measurement - Summary of Assets and Liabilities that Require Fair Value Measurements on a Recurring Basis (Details) - Fair Value Measurements on Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash equivalents	$ 18,438	$ 41,550
Liabilities
Development derivative liability (Note 8)	110,944	114,843
Level 1
Assets
Cash equivalents	18,438	41,550
Liabilities
Development derivative liability (Note 8)	0	0
Level 2
Assets
Cash equivalents	0	0
Liabilities
Development derivative liability (Note 8)	0	0
Level 3
Assets
Cash equivalents	0	0
Liabilities
Development derivative liability (Note 8)	$ 110,944	$ 114,843