Stock-Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options awards granted to nonemployee consultants and special advisors		825,000	860,000
Weighted average exercise price	$ 0.00	$ 5.80	$ 2.38
Option awards outstanding to non-employees	12,760,191	20,852,614	21,443,617	21,372,959
Unrecognized stock-based compensation relating to stock options	$ 1,382
Weighted-average remaining vesting period of stock options	2 years 11 months 5 days
Stock-Based Awards (Textual) [Abstract]
Stock option issuance period	10 years
Issue of common stock pursuant to stock options	25,000,000
Expire dates on options	March 16, 2014, to November 15,2021
Option issued period	Options are issued generally for terms of ten years
Stock options strike price	$ 1.07
Percentage of weighted-average price	50.00%
Options prices range, lower limit	$ 1.75
Options prices range, upper limit	$ 9.45
Weighted average exercise prices, option outstanding	$ 0.95
Excess fair value of option	589
Alternative strike price program expense	118	138	140
Estimated weighted-average fair value for options		$ 3.31	$ 2.38
Warrants outstanding	0
Period of employees are required to remain in the company	4 years
Excess fair value of option period	4 years
Options, exercised	(8,018,516)	(1,280,687)	(452,474)
Weighted average exercise price of options, exercised	$ 0.58	$ 0.64	$ 1.15
Employees And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense for option awards to nonemployee consultants and special advisors	1,436	2,402	3,824
Weighted-average remaining vesting period of stock options	2 years 5 months 19 days
Nonemployee Consultants and Special Advisors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options awards granted to nonemployee consultants and special advisors	1,320,833	1,320,833	1,398,333
Weighted average exercise price	$ 1.34
Option awards outstanding to non-employees	0
Stock-based compensation expense for option awards to nonemployee consultants and special advisors	0	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of unvested restricted stock awards granted to nonemployee consultants and special advisors	0	312,500	750,000
Unrecognized stock-based compensation relating to stock options	5,565
Restricted Stock [Member] | Employees And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense for option awards to nonemployee consultants and special advisors	3,814	2,041	2,921
Restricted Stock [Member] | Nonemployee Consultants and Special Advisors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense for option awards to nonemployee consultants and special advisors	$ 2,187	$ 2,698	$ 2,010
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	2 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	4 years
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	4 years