Stock-based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities remaining and available for future issuances (in shares)	64,739,929
Percentage of price lesser than fair market value per share (in hundredths)	90.00%
Stock-based compensation	$ 3,608,000	$ 3,904,000	$ 3,316,000
Stock Option Activity [Abstract]
Stock option vesting period	4 years
Stock option contractual term	10 years
Stock option vesting provisions	12/48 of a granted award will vest after one year of service, while an additional 1/48 of the award will vest at the end of each month thereafter for 36 months, or 1/48 of the award will vest at the end of each month over a four-year period.
Options [Roll Forward]
Balance as of January 1, 2013 (in shares)	6,744,986
Granted (in shares)	2,548,950
Exercised (in shares)	(17,500)
Expired (in shares)	(499,586)
Cancelled/forfeited (in shares)	(454,561)
Balance as of December 31, 2013 (in shares)	8,322,289	6,744,986
Vested and expected to vest at December 31, 2013 (in shares)	8,277,773
Exercisable at December 31, 2013 (in shares)	5,718,096
Weighted Average Exercise Price [Roll Forward]
Balance as of January 1, 2013 (in dollars per share)	$ 5.02
Granted (in dollars per share)	$ 3.23
Exercised (in dollars per share)	$ 2.14
Expired (in dollars per share)	$ 4.28
Cancelled/forfeited (in dollars per share)	$ 4.55
Balance as of December 31, 2013 (in dollars per share)	$ 4.55	$ 5.02
Vested and expected to vest at December 31, 2013 (in dollars per share)	$ 4.56
Exercisable at December 31, 2013 (in dollars per share)	$ 5.05
Weighted Average Remaining Contractual Term (Years) [Roll Forward]
Balance as of December 31, 2013	6 years 1 month 6 days
Vested and expected to vest at December 31, 2013	6 years 1 month 2 days
Exercisable at December 31, 2013	4 years 10 months 17 days
Aggregate Intrinsic Value [Roll Forward]
Balance	148,817
Vested and expected to vest at end of the year	147,931
Exercisable	111,654
Weighted Average Remaining Contractual Terms (years) [Abstract]
Total intrinsic value of stock options exercised	3,500	311,000	541,000
Black-Scholes-Merton option valuation model based on weighted-average assumptions [Abstract]
Expected term	6 years	5 years 2 months 12 days	5 years 6 months
Risk-free interest rate (in hundredths)	1.12%	0.83%	1.95%
Volatility (in hundredths)	75.27%	75.63%	72.36%
Dividends (in hundredths)	0.00%	0.00%	0.00%
Resulting weighted average grant date fair value (in dollars per share)	$ 1.72	$ 1.96	$ 3.24
Total compensation cost recognized for the stock options and restricted stock awards [Abstract]
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0)	3,608,000	3,904,000	3,316,000
Total compensation cost for share-based payment arrangements recognized in the statement of operations, tax	0	0	0
Total unamortized compensation cost related to outstanding unvested stock options and restricted stock awards	4,810,000	4,593,000
Total unamortized compensation cost related to outstanding vested stock options and restricted stock awards	4,725,000	3,918,000
Weighted average period for recognition of cost	1 year 9 months 22 days	1 year 6 months 22 days
Cash received from stock option and warrant exercises	225,000	1,413,000	2,849,000
Restricted Stock Awards [Member]
Restricted Stock Awards, Performance-Based Restricted Stock Awards [Roll Forward]
Outstanding, Beginning Balance (in shares)	294,741
Granted (in shares)	57,600
Exercised/Released (in shares)	(236,000)
Cancelled/forfeited (in shares)	(10,000)
Outstanding, Ending Balance (in shares)	106,341
Vested and expected to vest at December 31, 2013 (in shares)	106,341
Exercisable at December 31, 2013 (in shares)	85,341
Weighted Average Grant Date Fair Value [Roll Forward]
Balance as of January 1, 2013 (in dollars per share)	$ 3.55
Granted (in dollars per share)	$ 2.60
Exercised/Released (in dollars per share)	$ 3.29
Cancelled/forfeited	$ 3.44
Balance as of December 31, 2013 (in dollars per share)	$ 3.62
Weighted Average Exercise Price [Abstract]
Balance as of December 31, 2013 (in dollars per share)	$ 3.62
Vested and expected to vest at December 31, 2013 (in dollars per share)	$ 3.62
Exercisable at December 31, 2013 (in dollars per share)	$ 3.95
Weighted Average Remaining Contractual Terms (years) [Abstract]
Balance as of December 31, 2013	8 years 5 months 12 days
Vested and expected to vest	8 years 5 months 12 days
Exercisable at December 31, 2013	8 years 1 month 17 days
Performance Shares, Period Ending January 1, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period (in shares)		276,375	246,225
Restricted Stock Awards, Performance-Based Restricted Stock Awards [Roll Forward]
Outstanding, Beginning Balance (in shares)	261,300
Granted (in shares)	0
Vested (in shares)	0
Cancelled/forfeited (in shares)	(109,749)
Outstanding, Ending Balance (in shares)	151,551	261,300
Vested (in shares)	0
Weighted Average Grant Date Fair Value [Roll Forward]
Balance as of January 1, 2013 (in dollars per share)	$ 3.44
Cancelled/forfeited	$ 3.44
Balance as of December 31, 2013 (in dollars per share)	$ 3.44	$ 3.44
Performance Shares [Member]
Black-Scholes-Merton option valuation model based on weighted-average assumptions [Abstract]
Recognized compensation expense related to awards	344,000	107,000
Performance shares with modified terms [Member]
Total compensation cost recognized for the stock options and restricted stock awards [Abstract]
Total unamortized compensation cost related to outstanding unvested stock options and restricted stock awards	236,000
Shares vesting relateing to modified performance goals (in shares)	86,229
Fair value per share of modified performance shares (in dollars per share)	$ 2.74
1997 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	7,000,000
Share-based compensation, expiration date	Oct. 22, 2007
2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	3,000,000
Maximum limit for increase in outstanding stock (in hundredths)	2.00%
Securities remaining and available for future issuances (in shares)	700,647
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	500,000
Maximum percentage of common stock that may be purchased through payroll deductions (in hundredths)	15.00%
Stock-based compensation	75,000	53,000
Total compensation cost recognized for the stock options and restricted stock awards [Abstract]
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0)	$ 75,000	$ 53,000

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