Leases - Schedule of Operating and Financing Leases Presented in Balance Sheet (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating	$ 621
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance	$ 78
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Total leased assets	$ 699
Operating lease liabilities, current	$ 317
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent
Finance lease liabilities, current	$ 26
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesAndOtherLiabilities
Operating lease liabilities, noncurrent	$ 372
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance lease liabilities, noncurrent	$ 52
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 767