Stock Options (Exercise Price Range) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of stock options outstanding (in shares)	1,792	1,857	750
Weighted Average Remaining Contractual Life	7 years 10 months 10 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.21	$ 3.07	$ 2.90
Number of stock options exercisable (in shares)	410	605	570
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.71	$ 2.93	$ 3.12
Exercise Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 0.90
Exercise price range, upper range limit	$ 1.80
Number of stock options outstanding (in shares)	289
Weighted Average Remaining Contractual Life	7 years 6 months 18 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.28
Number of stock options exercisable (in shares)	89
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.44
Exercise Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 1.84
Exercise price range, upper range limit	$ 2.05
Number of stock options outstanding (in shares)	971
Weighted Average Remaining Contractual Life	8 years 7 months 28 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.97
Number of stock options exercisable (in shares)	95
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.89
Exercise Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 2.12
Exercise price range, upper range limit	$ 2.88
Number of stock options outstanding (in shares)	199
Weighted Average Remaining Contractual Life	6 years 6 months 22 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.36
Number of stock options exercisable (in shares)	103
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.42
Exercise Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 3.02
Exercise price range, upper range limit	$ 3.47
Number of stock options outstanding (in shares)	260
Weighted Average Remaining Contractual Life	8 years 2 months 12 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.07
Number of stock options exercisable (in shares)	50
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.02
Exercise Price Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 3.80
Exercise price range, upper range limit	$ 8.60
Number of stock options outstanding (in shares)	73
Weighted Average Remaining Contractual Life	10 months 2 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 5.48
Number of stock options exercisable (in shares)	73
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 5.48