Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Detail)

v3.4.0.3
Warrants - Summary of Warrant Activity (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 6.81
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 4,432
Warrants expired (in shares) (70)
Warrants outstanding, ending balance (in shares) 4,362
Warrant Issued With | Warrants Other Warrants  
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 6.81
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 4,372
Warrants expired (in shares) (10)
Warrants outstanding, ending balance (in shares) 4,362
Warrant Issued For | Warrant Derivative  
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 0
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 60
Warrants expired (in shares) (60)
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) | $ / shares $ 15.00
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 233
Warrants expired (in shares) 0
Warrants outstanding, ending balance (in shares) 233
Financing | Warrant Issued With | Warrants Other Warrants  
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 10.00
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 243
Warrants expired (in shares) 0
Warrants outstanding, ending balance (in shares) 243
Financing | Warrant Issued With | Warrants Other Warrants  
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 15.00
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 436
Warrants expired (in shares) 0
Warrants outstanding, ending balance (in shares) 436
Consulting | Warrant Issued With | Warrants Other Warrants  
Class of Warrant or Right [Line Items]  
Warrants, Exercise Price (usd per share) | $ / shares $ 10
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 10
Warrants expired (in shares) (10)
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) | $ / shares $ 4
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 60
Warrants expired (in shares) (60)
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) | $ / shares $ 5
Class of Warrants Outstanding [Roll Forward]  
Warrants outstanding, beginning balance (in shares) 3,450
Warrants expired (in shares) 0
Warrants outstanding, ending balance (in shares) 3,450