Debt, Commitments and Contingencies - Schedule of Future Minimum Payments under Non-cancelable Operating Lease and Reconciliation to Operating Lease Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases Operating [Abstract]
2020	$ 1,002
2021	1,031
2022	1,062
2023	404
Less: Amount representing interest	(505)
Present value of lease payments	2,994	$ 3,500
Less: Current portion of operating lease liability	(755)
Long-term operating lease liability	$ 2,239