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Commitments - Summary of Lease Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]    
Operating lease cost $ 455 $ 905
Finance lease cost 55 110
Total lease cost $ 510 $ 1,015