Quarterly report pursuant to Section 13 or 15(d)

Notes Payable to Former Stockholders - Schedule of Interest Expense Pertaining to Notes (Detail)

v3.8.0.1
Notes Payable to Former Stockholders - Schedule of Interest Expense Pertaining to Notes (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Interest Expense [Line Items]        
Interest expense $ 370 $ 380 $ 1,126 $ 1,155
Notes Payable to Former Stockholders [Member]        
Interest Expense [Line Items]        
Interest expense $ 110 $ 122 $ 345 $ 381