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 Marketable Securities (Details)

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Fair Value of Financial Instruments - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities $ 22,331 $ 16,793
Fair Value Measurements Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 108,350 82,936
Gross unrealized losses (10) (37)
Fair value 108,340 82,899
Cash and cash equivalents 86,009 66,106
Marketable securities 22,331 16,793
Fair Value Measurements Recurring | Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 43,454 52,164
Fair value 43,454 52,164
Cash and cash equivalents 43,454 52,164
Fair Value Measurements Recurring | Level 1 | Money Market Accounts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 39,793 6,725
Fair value 39,793 6,725
Cash and cash equivalents 39,793 6,725
Fair Value Measurements Recurring | Level 2 | Certificates Of Deposit    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 14,782 24,047
Gross unrealized losses   (37)
Fair value 14,782 24,010
Cash and cash equivalents 2,762 7,217
Marketable securities 12,020 $ 16,793
Fair Value Measurements Recurring | Level 2 | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 10,321  
Gross unrealized losses (10)  
Fair value 10,311  
Marketable securities $ 10,311