Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt $ 84,749    
Convertible Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 68,507 $ 68,335  
Equity component of convertible debt 13,000   $ 13,000
Notes Payable      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 2,018 2,229  
Fair Value | Convertible Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 62,700 78,557  
Fair Value | Notes Payable      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 2,018 $ 2,229