Quarterly report pursuant to Section 13 or 15(d)

Commitments - Schedule of Undiscounted Cash Flows for Operating Lease Liabilities Recorded in Condensed Balance Sheet (Detail)

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Commitments - Schedule of Undiscounted Cash Flows for Operating Lease Liabilities Recorded in Condensed Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Commitments And Contingencies Disclosure [Abstract]    
Remaining in 2019 $ 329  
2020 351  
Total lease payments 680  
Present value adjustment (53)  
Lease liabilities $ 627 $ 700