Stock-Based Compensation (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 11, 2013	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares	863,202	554,850	250,300
Stock-Based Compensation (Textual) [Abstract]
Expiry period of option plan	10 years
Shares available for future grants	1,222,739
Compensation expense recognized for stock option	$ 1,488	$ 3,355	$ 727
Cash received from options and warrants exercised	45	13	33
Expected dividend yield	0.00%	0.00%	0.00%
Number of stock options to purchase	2,426,533
Common stock at exercise prices range, minimum	$ 1.00
Common stock at exercise prices range, maximum	$ 11.11
Total options outstanding	1,620,320	1,627,329	942,916
Weighted Average Exercise Price per Share Vested and exercisable	$ 3.99	$ 4.08	$ 5.42
Total intrinsic value of options exercisable	29
Weighted average fair value of options granted	$ 2.28	$ 2.29	$ 4.26
Total intrinsic value of options exercised	86	5	87
Requisite service periods for options granted for employees	4 years	4 years	4 years
Requisite service periods for options granted to directors	1 year	1 year	1 year
Total options outstanding	2,426,533	2,057,104	2,132,879		2,031,023
Options nonvested	806,213
Total unrecognized compensation cost related to unvested options	947
Total unrecognized compensation cost to be recognized over the requisite service period	662
Fully vested options				900,000
Performance Milestones [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 285
Options vested upon the attainment of milestone	265,700
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares	3,724,028