Fair Value Measurements - Schedule of Financial Assets and Liabilities at Fair value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Assets, fair value	$ 20,080	$ 35,398
Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Assets:
Total assets	20,080	35,398
Liabilities:
Derivative liability		1,010
Total Liabilities		1,010
Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| Certificates of Deposit [Member]
Assets:
Assets, fair value		1,251
Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| U.S. Treasury Securities [Member]
Assets:
Assets, fair value	20,080	34,147
Level 1 [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Assets:
Total assets	20,080	34,147
Level 1 [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| U.S. Treasury Securities [Member]
Assets:
Assets, fair value	$ 20,080	34,147
Level 2 [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Assets:
Total assets		1,251
Level 2 [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member] \| Certificates of Deposit [Member]
Assets:
Assets, fair value		1,251
Level 3 [Member] \| Estimate of Fair Value Measurement [Member] \| Recurring [Member]
Liabilities:
Derivative liability		1,010
Total Liabilities		$ 1,010

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial and nonfinancial obligations.

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