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Cash Equivalents and Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 198,226 $ 166,038
Gross unrealized gain 0 0
Gross unrealized loss (40) 0
Available-for-sale Securities 198,186 166,038
Cash equivalents    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 145,747 166,038
Short-term investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 50,688 0
Long-term investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 1,751 0
Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 145,747 166,038
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Available-for-sale Securities 145,747 166,038
U.S. government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 52,479 0
Gross unrealized gain 0 0
Gross unrealized loss (40) 0
Available-for-sale Securities $ 52,439 $ 0