Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Detail)

v3.7.0.1
Warrants - Summary of Warrant Activity (Detail) - $ / shares
3 Months Ended
Mar. 28, 2017
Mar. 31, 2017
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share) $ 2.25 $ 4.92
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   7,033,000
Warrants issued (in shares) 44,901 443,000
Warrants exercised (in shares) (90,063) (868,000)
Warrants outstanding, ending balance (in shares)   6,608,000
Warrant Issued With | Non-derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 6.42
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   4,163,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   4,163,000
Warrant Issued For | Derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 2.35
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   2,870,000
Warrants issued (in shares)   443,000
Warrants exercised (in shares)   (868,000)
Warrants outstanding, ending balance (in shares)   2,445,000
Debt guarantee | Warrant Issued With | Non-derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 15.00
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   109,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   109,000
Financing | Warrant Issued With | Non-derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 10.00
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   243,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   243,000
Financing | Warrant Issued With | Non-derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 15.00
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   361,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   361,000
2016 Offerings | Warrant Issued For | Derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 2.25
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   2,870,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   (868,000)
Warrants outstanding, ending balance (in shares)   2,002,000
2015 Offering | Warrant Issued With | Non-derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 5
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   3,450,000
Warrants issued (in shares)   0
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   3,450,000
2017 Debt | Warrant Issued For | Derivative warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 2.82
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   0
Warrants issued (in shares)   443,000
Warrants exercised (in shares)   0
Warrants outstanding, ending balance (in shares)   443,000