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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]      
Prepaid insurance $ 30 $ 100 $ 585
Prepaid expenses 189 533 514
Prepaid income taxes   888 2,393
Other receivables 46 3 264
IPO costs 1,018    
Other current assets     167
Total prepaid expenses and other current assets $ 1,283 $ 1,524 $ 3,923