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Commitments and Contingencies - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 94 $ 188
Investing cash flows from operating leases 299 299
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases $ 6,518 $ 6,518