Fair Value Measurements of Financial Assets and Liabilities - Schedule of Financial Assets and Liabilities at Fair Value on Recurring Basis (Detail) - Recurring Basis [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Total Assets		$ 486
Liabilities:
CVR Liability	$ 3,060	5,531
Total Liabilities	3,060	5,531
Money Market Funds [Member]
Assets:
Cash equivalents		486
Level 2 [Member]
Assets:
Total Assets		486
Level 2 [Member] | Money Market Funds [Member]
Assets:
Cash equivalents		486
Level 3 [Member]
Liabilities:
CVR Liability	3,060	5,531
Total Liabilities	$ 3,060	$ 5,531