Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease expiry year	2026
Operating lease liabilities	$ 5,208			$ 6,000
ROU assets	3,941		$ 4,032	4,600
Deferred rent credit de-recognized				$ 1,400
Operating lease cost	300	$ 300
Cash payments related to operating lease liabilities	$ 400	$ 400
Operating lease, weighted average remaining lease term	5 years 2 months 12 days
Operating lease, weighted average discount rate, percent	7.80%
Operating lease liability payments not yet commenced	$ 300
Operating lease, weighted average lease not yet commenced, term	4 years