Stock-based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation expense:
Stock-based compensation expense	$ 177,542,000	$ 126,835,000	$ 113,804,000
Less: stock-based compensation expense capitalized to inventories	(1,423,000)	(1,048,000)	(1,254,000)
Allocated stock-based compensation expense	177,542,000	126,835,000	113,804,000
Weighted-average assumptions for options and ESPP subscriptions granted
Weighted average fair value (usd per share)	$ 92.00
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)	$ 29.59	$ 21.08	$ 12.90
Expected stock price volatility (percent)	60.32%	54.69%	46.90%
Risk-free interest rate (percent)	0.09%	0.08%	0.16%
Expected term of options (in years)	9 months	8 months 26 days	8 months 26 days
Expected annual dividends	0	0	0
Stock options
Stock-based compensation expense:
Stock-based compensation expense	99,961,000	84,599,000	78,566,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	156,969,000
Weighted-average Recognition Period (in years)	2 years 1 month 17 days
Weighted-average grant-date fair value, granted (in dollars per share)	$ 39.95	$ 25.79	$ 19.72
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (percent)	50.86%	46.20%	47.93%
Risk-free interest rate (percent)	1.77%	1.25%	0.95%
Expected term of options (in years)	5 years 5 months 19 days	5 years 9 months 22 days	5 years 9 months 11 days
Expected annual dividends	0	0	0
Restricted stock and restricted stock units
Stock-based compensation expense:
Stock-based compensation expense	70,678,000	36,479,000	29,194,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	148,037,000
Weighted-average Recognition Period (in years)	2 years 9 months 14 days
ESPP share issuances
Stock-based compensation expense:
Stock-based compensation expense	8,326,000	6,805,000	7,298,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	4,262,000
Weighted-average Recognition Period (in years)	7 months 10 days
Research and development expenses
Stock-based compensation expense:
Stock-based compensation expense	116,998,000	81,183,000	71,243,000
Sales, general and administrative expenses
Stock-based compensation expense:
Stock-based compensation expense	$ 60,544,000	$ 45,652,000	$ 42,561,000