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Balance Sheet Details - Short-Term Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Short-term investments    
Amortized cost $ 69,700  
Gross unrealized losses 148  
Fair Value 69,552 $ 0
Government agency bonds    
Short-term investments    
Amortized cost 5,513  
Gross unrealized losses 10  
Fair Value $ 5,503  
Government agency bonds | Minimum    
Short-term investments    
Maturity 1 year  
Government agency bonds | Maximum    
Short-term investments    
Maturity 3 years  
Commercial paper    
Short-term investments    
Amortized cost $ 12,342  
Gross unrealized losses 2  
Fair Value $ 12,340  
Commercial paper | Maximum    
Short-term investments    
Maturity 1 year  
Corporate notes    
Short-term investments    
Amortized cost $ 45,051  
Gross unrealized losses 110  
Fair Value $ 44,941  
Corporate notes | Minimum    
Short-term investments    
Maturity 1 year  
Corporate notes | Maximum    
Short-term investments    
Maturity 3 years  
Asset-backed securities    
Short-term investments    
Amortized cost $ 6,794  
Gross unrealized losses 26  
Fair Value $ 6,768  
Asset-backed securities | Minimum    
Short-term investments    
Maturity 1 year  
Asset-backed securities | Maximum    
Short-term investments    
Maturity 3 years