Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Notes Payable to Former Stockholders - Schedule of Interest Expense Pertaining to Notes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest Expense [Line Items]      
Interest expense $ 1,726 $ 1,651 $ 105
Notes Payable to Former Stockholders [Member]      
Interest Expense [Line Items]      
Interest expense $ 548 $ 591