Commitments and Contingencies - Information Related to Right-of-use Assets and Lease Liabilities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
Operating lease costs	$ 490
Operating cash flows from operating leases	486
Right-of-use assets obtained in exchange for new operating lease obligations at adoption	$ 1,180
Weighted-average remaining lease term (years)	5 years 7 days
Weighted average discount rate	17.65%