Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
U.S. treasury securities	$ 0	$ 74,999
Mortgage backed securities	3,398	4,206
Total	3,398	79,205
Fair Value, Inputs, Level 1 [Member]
Assets:
U.S. treasury securities	0	0
Mortgage backed securities	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
U.S. treasury securities	0	74,999
Mortgage backed securities	3,398	4,206
Total	3,398	79,205
Fair Value, Inputs, Level 3 [Member]
Assets:
U.S. treasury securities	0	0
Mortgage backed securities	0	0
Total	$ 0	$ 0