Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2010	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of stock-based compensation expense
Stock-based compensation		$ 1,242	$ 1,251	$ 2,631	$ 2,536
Stock options [Member]
Schedule of stock-based compensation expense
Stock-based compensation		267	269	571	517
RSAs and RSUs [Member]
Schedule of stock-based compensation expense
Stock-based compensation		561	662	1,135	1,454
Performance stock units [Member]
Schedule of stock-based compensation expense
Stock-based compensation		414	320	925	565
Research and development [Member]
Schedule of stock-based compensation expense
Stock-based compensation		222	238	442	529
Selling, General and Administrative Expenses [Member]
Schedule of stock-based compensation expense
Stock-based compensation		$ 1,020	$ 1,013	$ 2,189	$ 2,007
One Year Vesting Period [Member] | Stock options [Member]
Schedule of stock-based compensation expense
Award vesting rights	25.00%
Monthly, Three Year Vesting Period [Member] | Stock options [Member]
Schedule of stock-based compensation expense
Award vesting rights	75.00%
Monthly, Three Year Vesting Period [Member] | Restricted Stock Units (RSUs) [Member]
Schedule of stock-based compensation expense
Award vesting rights				33.3333%
Annually, Four Year Vesting Period [Member] | Restricted Stock Units (RSUs) [Member]
Schedule of stock-based compensation expense
Award vesting rights	25.00%