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Convertible Debt - Summary of Debt (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Apr. 01, 2014
Jan. 24, 2013
Debt Instrument [Line Items]        
Total debt $ 180,558,000 $ 211,132,000    
Fair value of embedded derivative 0 82,000    
Unamortized debt discount (5,668,000) (8,749,000)    
Debt issuance costs (270,000) (450,000)    
Long-term portion of debt 174,620,000 202,015,000    
2018 Notes, due February 1, 2018 | Convertible Senior Subordinated Notes        
Debt Instrument [Line Items]        
Convertible debt 32,485,000 61,632,000   $ 125,000,000.0
2019 Notes, due October 1, 2019 | Convertible Senior Subordinated Notes        
Debt Instrument [Line Items]        
Convertible debt $ 148,073,000 $ 149,500,000 $ 149,500,000.0