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) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 14, 2016
May 25, 2016
Sep. 30, 2016
Class of Warrant or Right [Line Items]      
Fair value of warrants issued     $ 3,526
Warrants, Exercise Price (usd per share)     $ 4.88
Class of Warrants Outstanding [Roll Forward]      
Warrants outstanding, beginning balance (in shares)     4,432,000
Warrants issued (in shares)     2,870,000
Warrants expired (in shares)     (157,000)
Warrants outstanding, ending balance (in shares)     7,145,000
Warrant Issued With | Warrants Other Warrants      
Class of Warrant or Right [Line Items]      
Warrants, Exercise Price (usd per share)     $ 6.65
Class of Warrants Outstanding [Roll Forward]      
Warrants outstanding, beginning balance (in shares)     4,372,000
Warrants issued (in shares)     0
Warrants expired (in shares)     (97,000)
Warrants outstanding, ending balance (in shares)     4,275,000
Warrant Issued For | Warrant Derivative      
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)     60,000
Warrants issued (in shares)     2,870,000
Warrants expired (in shares)     (60,000)
Warrants outstanding, ending balance (in shares)     2,870,000
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
Private Placement - September Offering | Warrant Derivative      
Class of Warrants Outstanding [Roll Forward]      
Warrants issued (in shares) 1,512,500    
2016 Offerings | Warrant Derivative      
Class of Warrants Outstanding [Roll Forward]      
Warrants issued (in shares)   1,357,301  
2016 Offerings | 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)     2,870,000
Warrants expired (in shares)     0
Warrants outstanding, ending balance (in shares)     2,870,000