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Cash and Cash Equivalents and Fair Value of Financial Instruments - Schedule of Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized Cost $ 126,379 $ 104,531 $ 87,334 $ 62,313
Cash, cash equiv and S-T-I: Amortized cost 126,379 104,531    
Cash, cash equiv and S-T-I: Gross unrealized gains 0 0    
Cash, cash equiv and S-T-I: Gross unrealized losses 0 0    
Cash, Cash Equivalents, and Short-term Investments 126,379 104,531    
Cash
        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized Cost 68,333 38,823    
Cash and cash equivalents - gross unrealized gain 0 0    
Cash and cash equivalents - Gross unrealized losses 0 0    
Cash and Cash Equivalents, Fair Value Disclosure 68,333 38,823    
Money Market Funds
        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized Cost 58,046 65,708    
Cash and cash equivalents - gross unrealized gain 0 0    
Cash and cash equivalents - Gross unrealized losses 0 0    
Cash and Cash Equivalents, Fair Value Disclosure 58,046 65,708    
Cash and Cash Equivalents
        
Schedule of Available-for-sale Securities [Line Items]        
Cash, Cash Equivalents, and Short-term Investments 126,379 104,531    
Cash and Cash Equivalents | Cash
        
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 68,333 38,823    
Cash and Cash Equivalents | Money Market Funds
        
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure $ 58,046 $ 65,708