Stock-based Compensation Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-based compensation expense:
Stock-based compensation expense	$ 231,025,000	$ 177,542,000	$ 126,835,000
Less: stock-based compensation expense capitalized to inventories	(4,087,000)	(1,423,000)	(1,048,000)
Allocated stock-based compensation expense	231,025,000	$ 177,542,000	$ 126,835,000
Stock Options
Weighted-average assumptions for options and ESPP subscriptions granted
Expected annual dividends	$ 0
Employee Stock Purchase Plan
Weighted-average assumptions for options and ESPP subscriptions granted
Weighted average fair value (usd per share)	$ 37.84	$ 29.59	$ 21.08
Expected stock price volatility (percent)	47.20%	60.32%	54.69%
Risk-free interest rate (percent)	0.40%	0.09%	0.08%
Expected term of options (in years)	8 months 20 days	9 months	8 months 26 days
Expected annual dividends	$ 0	$ 0	$ 0
Stock options
Stock-based compensation expense:
Stock-based compensation expense	129,276,000	$ 99,961,000	$ 84,599,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	$ 170,971,000
Weighted-average Recognition Period (in years)	2 years 2 months 1 day
Weighted-average grant-date fair value, granted (in dollars per share)	$ 52.16	$ 39.95	$ 25.79
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (percent)	47.29%	50.86%	46.20%
Risk-free interest rate (percent)	1.61%	1.77%	1.25%
Expected term of options (in years)	5 years 3 months 11 days	5 years 5 months 19 days	5 years 9 months 22 days
Expected annual dividends	$ 0	$ 0	$ 0
Restricted stock and restricted stock units
Stock-based compensation expense:
Stock-based compensation expense	98,811,000	70,678,000	36,479,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	$ 168,742,000
Weighted-average Recognition Period (in years)	2 years 7 months 2 days
ESPP share issuances
Stock-based compensation expense:
Stock-based compensation expense	$ 7,025,000	8,326,000	6,805,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	$ 6,232,000
Weighted-average Recognition Period (in years)	7 months 24 days
Research and development expenses
Stock-based compensation expense:
Stock-based compensation expense	$ 152,955,000	116,998,000	81,183,000
Sales, general and administrative expenses
Stock-based compensation expense:
Stock-based compensation expense	$ 78,070,000	$ 60,544,000	$ 45,652,000