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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Cash equivalents:    
Total assets at fair value on a recurring basis $ 100 $ 100
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis 12,473 3,278
Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis 100 100
Deferred payments [Member]    
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis 12,473 3,278
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis $ 100 $ 100
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis $ 100 $ 100
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Deferred payments [Member]    
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Deferred payments [Member]    
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis
Significant Unobservable Inputs (Level 3) [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis $ 12,473 $ 3,278
Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Significant Unobservable Inputs (Level 3) [Member] | Deferred payments [Member]    
Other long-term liabilities:    
Total liabilities at fair value on a recurring basis $ 12,473 $ 3,278