Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Short-term Investments (Details)

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Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and cash equivalents        
Cash $ 48,533 $ 52,164    
Money market accounts 39,277 6,725    
Certificates of deposit 5,041 7,217    
Total cash and cash equivalents 92,851 66,106 $ 56,836 $ 13,521
Marketable securities        
Marketable securities 21,033 16,793    
Certificates Of Deposit        
Marketable securities        
Marketable securities 10,855 $ 16,793    
Corporate Bonds        
Marketable securities        
Marketable securities $ 10,178