Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Cash, Cash Equivalents and Short-term Investments (Details)

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Balance Sheet Components - Summary of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Cash and cash equivalents        
Cash $ 42,290 $ 52,164    
Money market accounts 33,270 6,725    
Certificates of deposit 8,940 7,217    
Total cash and cash equivalents 84,500 66,106 $ 51,822 $ 56,836
Short-term investments        
Short-term investments 13,616 16,793    
Certificates Of Deposit        
Short-term investments        
Short-term investments $ 13,616 $ 16,793