Stock-Based Compensation (Employee Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Stock Based Compensation Expense
Stock-based compensation expense (in dollars)	$ 4,713	$ 3,928	$ 14,102	$ 12,055
Cost of product revenues
Employee Stock Based Compensation Expense
Stock-based compensation expense (in dollars)	140	129	451	401
Research and development expense.
Employee Stock Based Compensation Expense
Stock-based compensation expense (in dollars)	1,123	996	3,646	3,149
Selling and marketing
Employee Stock Based Compensation Expense
Stock-based compensation expense (in dollars)	1,359	1,132	4,234	3,406
General and administrative
Employee Stock Based Compensation Expense
Stock-based compensation expense (in dollars)	$ 2,091	$ 1,671	$ 5,771	$ 5,099