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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and cash equivalents        
Cash $ 52,164 $ 2,941    
Money market accounts 6,725 42,262    
Certificates of deposit 7,217 11,633    
Total cash and cash equivalents 66,106 $ 56,836 $ 13,521 $ 15,112
Short-term investments        
Short-term investments 16,793      
Certificates Of Deposit        
Short-term investments        
Short-term investments $ 16,793