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Marketable Securities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Cash equivalents and marketable securities    
Maximum maturity period of available-for-sale securities (in years) 3 years 3 years
Maximum remaining maturity period of available-for-sale securities (in years) 1 year 1 year
Fair Value $ 90,168 $ 252,737
Amortized Cost 90,214 252,925
Gross Unrealized Gains 1 0
Gross Unrealized Losses (47) (188)
Cash, fair value 60,621 34,969
Cash, amortized cost 60,621 34,969
Cash, cash equivalents and marketable securities    
Fair Value 150,789 287,706
Amortized Cost 150,835 287,894
Gross Unrealized Gains 1 0
Gross Unrealized Losses (47) (188)
Money market funds    
Cash equivalents and marketable securities    
Fair Value 12,562 77,804
Amortized Cost 12,562 77,804
Gross Unrealized Gains 0 0
Gross Unrealized Losses $ 0 $ 0
Weighted Rate of Return (as a percent) 0.24% 0.12%
US Treasury and Government Short-term Debt Securities [Member]    
Cash equivalents and marketable securities    
Fair Value $ 7,001 $ 14,110
Amortized Cost 7,000 14,142
Gross Unrealized Gains 1 0
Gross Unrealized Losses $ 0 $ (32)
Weighted Rate of Return (as a percent) 0.44% 0.48%
Corporate notes, bonds and commercial paper    
Cash equivalents and marketable securities    
Fair Value $ 70,605 $ 160,823
Amortized Cost 70,652 160,979
Gross Unrealized Gains 0 0
Gross Unrealized Losses $ (47) $ (156)
Weighted Rate of Return (as a percent) 0.62% 0.45%