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Information Pertaining to 2017 Notes (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]    
Loss from change in fair value of the 2017 Notes $ 339 $ 836
2017 Notes    
Debt Instrument [Line Items]    
Principal Amount of Notes, Beginning Balance 26,108  
Paydown of principal balance (9,616)  
Principal Amount of Notes, Ending Balance 16,492  
Change in Estimated Fair Value, Beginning Balance (339)  
Loss from change in fair value of debt 339  
Beginning Balance 25,769  
Loss from change in fair value of the 2017 Notes 339  
Paydown of principal balance (9,616)  
Ending Balance $ 16,492