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Schedule of Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]    
Deposits $ 1,267 $ 1,413
Prepaid expenses and other 11,849 10,423
Total other current assets $ 13,116 $ 11,836