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Fair Value of Financial Instruments (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Convertible Notes Payable $ 131,490 $ 126,167
1.125% Convertible Senior Notes due 2018    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 138,000 138,000
1.125% Convertible Senior Notes due 2018 | Convertible Senior Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount   138,000
Convertible Notes Payable   126,167
Convertible Debt, Fair Value Disclosures   $ 173,961
Convertible notes stated interest rate (as a percent)   1.125%
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 138,000  
Convertible Notes Payable 131,490  
Convertible Debt, Fair Value Disclosures $ 163,737  
Convertible notes stated interest rate (as a percent) 1.125%