Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Lease right-of-use asset, Non-current	$ 1,734
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PrepaidExpenseAndOtherAssetsNoncurrent
Operating lease liability, Current	$ 2,683
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesAndOtherLiabilities
Operating lease, Weighted Average Remaining Lease Term	1 year
Operating lease, Weighted Average Discount Rate	7.06%