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Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid insurances $ 1,992 $ 654
Prepaid subscriptions 1,482 1,161
Prepaid other 1,474 528
Interest receivable 849 900
Prepaid rent and maintenance 658 526
Other receivable 353 2,908
Total prepaid expenses and other current assets $ 6,808 $ 6,677