Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Short-term Investments (Details)

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Summary of Significant Accounting Policies - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Short-term Investments (Details) - Fair Value Measurements Recurring - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost $ 82,936 $ 56,836
Gross unrealized losses (37)  
Fair value 82,899 56,836
Cash and cash equivalents 66,106 56,836
Short-term investments 16,793  
Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 52,164 2,941
Fair value 52,164 2,941
Cash and cash equivalents 52,164 2,941
Level 1 | Money Market Accounts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 6,725 42,262
Fair value 6,725 42,262
Cash and cash equivalents 6,725 42,262
Level 2 | Certificates Of Deposit    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 24,047 11,633
Gross unrealized losses (37)  
Fair value 24,010 11,633
Cash and cash equivalents 7,217 $ 11,633
Short-term investments $ 16,793