Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Fixed operating lease cost	$ 218	$ 187
Short-term lease costs	38	8
Total lease expense	256	195
Operating cash flows from operating leases	242	201
Sublease income	$ 48	0
Leased assets obtained in exchange for new operating lease liabilities		$ 484
Weighted-average remaining lease term-operating leases (in years)	2 years 9 months 18 days	3 years 10 months 24 days
Weighted-average discount rate-operating leases	9.00%	9.00%