Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Fixed operating lease cost	$ 541	$ 216	$ 1,017	$ 434
Short-term lease costs	0	38	42	76
Total lease expense	541	254	1,059	510
Right-of-use asset obtained in exchange for operating lease liabilities	0
Operating cash flows from operating leases	280	242	603	484
Sublease income	$ 49	$ 48	$ 98	$ 97
Weighted-average remaining lease term-operating leases (in years)	5 years 4 months 24 days		5 years 4 months 24 days
Weighted-average discount rate-operating leases	11.30%		11.30%