Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Detail)

v3.5.0.2
Warrants - Summary of Warrant Activity (Detail) - $ / shares
6 Months Ended
May 25, 2016
Jun. 30, 2016
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 5.59
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   4,432,000
Warrants issued (in shares)   1,357,000
Warrants expired (in shares)   (157,000)
Warrants outstanding, ending balance (in shares)   5,632,000
Warrant Issued With | Warrants Other Warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 5.59
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   4,372,000
Warrants issued (in shares)   1,357,000
Warrants expired (in shares)   (97,000)
Warrants outstanding, ending balance (in shares)   5,632,000
Warrant Issued For | Warrant Derivative    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 0
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   60,000
Warrants issued (in shares)   0
Warrants expired (in shares)   (60,000)
Warrants outstanding, ending balance (in shares)   0
Debt guarantee | Warrant Issued With | Warrants Other 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)   233,000
Warrants issued (in shares)   0
Warrants expired (in shares)   (87,000)
Warrants outstanding, ending balance (in shares)   146,000
Financing | Warrant Issued With | Warrants Other 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 expired (in shares)   0
Warrants outstanding, ending balance (in shares)   243,000
Financing | Warrant Issued With | Warrants Other 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)   436,000
Warrants issued (in shares)   0
Warrants expired (in shares)   0
Warrants outstanding, ending balance (in shares)   436,000
Consulting | Warrant Issued With | Warrants Other Warrants    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 10
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   10,000
Warrants issued (in shares)   0
Warrants expired (in shares)   (10,000)
Warrants outstanding, ending balance (in shares)   0
Financing | Warrant Issued For | Warrant Derivative    
Class of Warrant or Right [Line Items]    
Warrants, Exercise Price (usd per share)   $ 4
Class of Warrants Outstanding [Roll Forward]    
Warrants outstanding, beginning balance (in shares)   60,000
Warrants issued (in shares)   0
Warrants expired (in shares)   (60,000)
Warrants outstanding, ending balance (in shares)   0
2015 Offering | Warrant Issued With | Warrants Other 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 expired (in shares)   0
Warrants outstanding, ending balance (in shares)   3,450,000
2016 Offering    
Class of Warrants Outstanding [Roll Forward]    
Warrants issued (in shares) 1,357,301  
2016 Offering | Warrant Issued With | Warrants Other 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)   0
Warrants issued (in shares)   1,357,000
Warrants expired (in shares)   0
Warrants outstanding, ending balance (in shares)   1,357,000