Leases - Information related to Right-of-use Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Cash paid for operating lease liabilities	$ 66	$ 192
Right-of-use assets obtained in exchange for new operating lease obligations	$ 1,890	$ 0
Weighted-average remaining lease term	4 years 6 months
Weighted-average discount rate	12.30%	0.00%