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Summary of Carrying Amount of Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Facility financing obligation $ 8,974 $ 11,298
Senior convertible notes 19,031 19,099
Note payable to related party 71,981 72,089
Total debt - net carrying amount $ 99,986 $ 102,486