Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value of Financial Instruments - 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
Jun. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost $ 98,119 $ 82,936
Gross unrealized losses (3) (37)
Fair value 98,116 82,899
Cash and cash equivalents 84,500 66,106
Short-term investments 13,616 16,793
Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 42,290 52,164
Fair value 42,290 52,164
Cash and cash equivalents 42,290 52,164
Level 1 | Money Market Accounts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 33,270 6,725
Fair value 33,270 6,725
Cash and cash equivalents 33,270 6,725
Level 2 | Certificates Of Deposit    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 22,559 24,047
Gross unrealized losses (3) (37)
Fair value 22,556 24,010
Cash and cash equivalents 8,940 7,217
Short-term investments $ 13,616 $ 16,793