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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid insurance $ 338 $ 514
Prepaid expenses 1,001 861
Prepaid income taxes 2,986  
Other receivables 493 28
Total prepaid expenses and other current assets $ 4,818 $ 1,403