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	Jun. 30, 2022	Dec. 31, 2021
Assets:
Cash equivalents	$ 7,570	$ 41,550
Liabilities:
Development derivative liability (Note 8)	106,573	114,843
Level 1
Assets:
Cash equivalents	7,570	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)	$ 106,573	$ 114,843