Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Notes Payable to Former Stockholders - Schedule of Interest Expense Pertaining to Notes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Interest Expense [Line Items]        
Interest expense $ 380 $ 397 $ 1,349 $ 1,202
Notes Payable to Former Stockholders [Member]        
Interest Expense [Line Items]        
Interest expense $ 133 $ 144 $ 414 $ 447