Leases - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease expiry year	2026
Operating lease liabilities	$ 5,182			$ 6,000
ROU assets	3,949		$ 4,032	4,600
Deferred rent credit de-recognized				$ 1,400
Operating lease cost	700	$ 700
Cash payments related to operating lease liabilities	$ 700	$ 700
Operating lease, weighted average remaining lease term	5 years
Operating lease, weighted average discount rate, percent	7.70%