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Accrued expenses and other current liabilities - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Employee compensation expenses $ 4,429 $ 2,530
Litigation settlement payable 4,000  
Professional fee payable 4,575 2,954
Business credit card payable 2,070 117
Puttable common stock that may require cash settlement 1,350  
Accrued interest expense 94 231
Insurance payable 138 227
Advertising and marketing expenses payable 293 174
Deferred rent 318 113
Miscellaneous expenses payable 879 635
Total $ 18,146 $ 6,981