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Debt - Summary of Debt (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Apr. 01, 2014
Jan. 24, 2013
Debt Instrument [Line Items]        
Total debt $ 211,132,000 $ 211,138,000    
Fair value of embedded derivative 82,000 83,000    
Unamortized debt discount (8,749,000) (11,124,000)    
Current portion of debt 0 (6,000)    
Long-term portion of debt 202,465,000 200,091,000    
Equipment note        
Debt Instrument [Line Items]        
Current portion of debt 0 (6,000)    
2018 Notes | Convertible Senior Subordinated Notes        
Debt Instrument [Line Items]        
Convertible Subordinated Debt, Noncurrent 61,632,000 61,632,000   $ 125,000,000.0
2019 Notes | Convertible Senior Subordinated Notes        
Debt Instrument [Line Items]        
Convertible Subordinated Debt, Noncurrent $ 149,500,000 $ 149,500,000 $ 149,500,000.0