Quarterly report pursuant to Section 13 or 15(d)

Notes Payable to Former Stockholders - Schedule of Accounts Payable and Accrued Expenses Pertaining to Notes (Detail)

v3.8.0.1
Notes Payable to Former Stockholders - Schedule of Accounts Payable and Accrued Expenses Pertaining to Notes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts Payable and Accrued Expenses [Member]    
Accounts Payable And Accrued Expenses [Line Items]    
Accrued interest $ 196 $ 337