v3.6.0.2
Fair Value Measurements - Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 26, 2016
Dec. 31, 2015
Financial instruments measured at fair value on a recurring basis    
Warrant liabilities   $ 6,927
Convertible Preferred Stock Warrants    
Financial instruments measured at fair value on a recurring basis    
Warrant liabilities $ 12,600  
Recurring | Convertible Preferred Stock Warrants    
Financial instruments measured at fair value on a recurring basis    
Warrant liabilities   6,927
Recurring | Level 3 | Convertible Preferred Stock Warrants    
Financial instruments measured at fair value on a recurring basis    
Warrant liabilities   $ 6,927