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Fair Value Measurement of Assets and Liabilities - Other Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 10, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible debt, fair value $ 82,500  
Convertible Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible debt, face amount $ 120,000 $ 120,000
Convertible debt, stated interest rate   5.50%