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Balance Sheet Components - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]      
Significant realized gains or losses on available-for-sale securities $ 0    
Depreciation and amortization $ 1,384,000 $ 684,000 $ 444,000
Maximum      
Schedule Of Available For Sale Securities [Line Items]      
Available-for-sale securities remaining contractual maturities 3 years