Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Total operating lease liabilities	$ 1,592
Operating Lease, Right-of-Use Asset	$ 1,589
Lessee, Operating Lease, Term of Contract	12 months
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Total operating lease liabilities	$ 1,600
Operating Lease, Right-of-Use Asset	$ 1,600