Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Stock Option and Purchase Plans (Details 4) (USD $)	12 Months Ended
Stock Option and Purchase Plans (Details 4) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-Based Compensation Expense
Share-based compensation expense before taxes	$ 15,938,000	$ 7,353,000	$ 7,413,000
Share-based compensation expense, net of taxes	15,938,000	7,353,000	7,413,000
Restricted stock units
Share-Based Compensation Expense
Share-based compensation expense, net of taxes	292,000
Net share-based compensation expense, per common share:
Unrecognized estimated compensation expense	569,000
Weighted average remaining requisite service period (in months)	2 years 1 month 6 days
Stock options
Share-Based Compensation Expense
Share-based compensation expense, net of taxes	15,531,000	7,259,000	7,272,000
Net share-based compensation expense, per common share:
Unrecognized estimated compensation expense	19,900,000
Weighted average remaining requisite service period (in months)	1 year 2 months 12 days
Weighted average assumptions for fair value of each option using the Black-Scholes option pricing model
Expected life (in years)	5.54	5.93	5.82
Volatility (as a percent)	82.49%	77.46%	67.72%
Risk-free interest rate (as a percent)	1.00%	2.59%	2.59%
Employee stock purchase plan
Share-Based Compensation Expense
Share-based compensation expense, net of taxes	115,000	94,000	141,000
Net share-based compensation expense, per common share:
Unrecognized estimated compensation expense	123,000
Weighted average remaining requisite service period (in months)	4 years 6 months
Inventory
Share-Based Compensation Expense
Share-based compensation expense before taxes	196,000
Continuing Operations:
Share-Based Compensation Expense
Share-based compensation expense before taxes	15,938,000	7,353,000	6,443,000
Continuing Operations: \| Research and development
Share-Based Compensation Expense
Share-based compensation expense before taxes	3,487,000	1,917,000	1,204,000
Continuing Operations: \| Selling, general and administrative
Share-Based Compensation Expense
Share-based compensation expense before taxes	12,451,000	5,436,000	5,239,000
Discontinued Operations:
Share-Based Compensation Expense
Share-based compensation expense before taxes			970,000
Discontinued Operations: \| Cost of goods sold and manufacturing
Share-Based Compensation Expense
Share-based compensation expense before taxes			810,000
Discontinued Operations: \| Selling, general and administrative
Share-Based Compensation Expense
Share-based compensation expense before taxes			$ 160,000