Period which an employee's right to exercise an award in contractual term is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Stock-based Compensation (Details) - USD ($)			12 Months Ended
Stock-based Compensation (Details) - USD ($)	Dec. 29, 2015	Aug. 13, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities remaining and available for future issuances (in shares)			94,237,220
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, 2015 (in shares)			9,115,348
Granted (in shares)			2,168,000
Exercised (in shares)			0
Expired (in shares)			(445,151)
Cancelled/forfeited (in shares)			(2,232,292)
Balance as of December 31, 2015 (in shares)			8,605,905	9,115,348
Vested and expected to vest at December 31, 2015 (in shares)			8,470,861
Exercisable at December 31, 2015 (in shares)			5,368,247
Weighted Average Exercise Price [Roll Forward]
Balance as of January 1, 2015 (in dollars per share)			$ 3.93
Granted (in dollars per share)			0.46
Exercised (in dollars per share)			0
Expired (in dollars per share)			3.85
Cancelled/forfeited (in dollars per share)			4.23
Balance as of December 31, 2015 (in dollars per share)			2.99	$ 3.93
Vested and expected to vest at December 31, 2015 (in dollars per share)			3.02
Exercisable at December 31, 2015 (in dollars per share)			$ 4.04
Weighted Average Remaining Contractual Term [Roll Forward]
Balance as of December 31, 2015			6 years 8 months 8 days
Vested and expected to vest at December 31, 2015			6 years 7 months 24 days
Exercisable at December 31, 2015			5 years 4 months 20 days
Aggregate Intrinsic Value [Roll Forward]
Balance			$ 0
Vested and expected to vest at end of the year			0
Exercisable			0
Weighted Average Remaining Contractual Terms [Abstract]
Total intrinsic value of stock options exercised			$ 0	$ 200	$ 3,500
Black-Scholes-Merton option valuation model based on weighted-average assumptions [Abstract]
Expected term			6 years	6 years	6 years
Risk-free interest rate			1.58%	1.86%	1.12%
Volatility			75.07%	77.52%	75.27%
Dividends			0.00%	0.00%	0.00%
Resulting weighted average grant date fair value (in dollars per share)			$ 0.30	$ 1.35	$ 1.72
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)			$ 2,041,000	$ 3,101,000	$ 3,608,000
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			2,358,000
Total unamortized compensation cost related to outstanding vested stock options and restricted stock awards			$ 2,358,000
Weighted average period for recognition of cost			1 year 7 months 10 days
Cash received from stock option and warrant exercises			$ 4,997,000	$ 4,151,000	$ 225,000
Restricted Stock Awards [Member]
Restricted Stock Awards, Performance-Based Restricted Stock Awards [Roll Forward]
Outstanding, Beginning Balance (in shares)			199,223
Granted (in shares)			541,377
Exercised/Released (in shares)			(152,682)
Expired (in shares)			(108,877)
Cancelled/forfeited (in shares)			(11,100)
Outstanding, Ending Balance (in shares)			467,941	199,223
Vested and expected to vest at December 31, 2013 (in shares)			279,897
Exercisable at December 31, 2015 (in shares)			18,241
Weighted Average Grant Date Fair Value [Roll Forward]
Balance as of January 1, 2015 (in dollars per share)			$ 3.09
Granted (in dollars per share)			0.68
Exercised/Released (in dollars per share)			3.13
Expired (in dollars per share)			0.73
Cancelled/forfeited (in dollars per share)			1.84
Balance as of December 31, 2015 (in dollars per share)			0.81	$ 3.09
Weighted Average Exercise Price [Abstract]
Balance as of December 31, 2015 (in dollars per share)			0.81
Vested and expected to vest at December 31, 2015 (in dollars per share)			0.90
Exercisable at December 31, 2015 (in dollars per share)			$ 3.21
Weighted Average Remaining Contractual Terms [Abstract]
Balance as of December 31, 2015			11 months 8 days
Vested and expected to vest			1 year 2 months 16 days
Exercisable at December 31, 2015			6 years 9 months 25 days
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			2.00%
2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares to be issued (in shares)		4,527,000	3,975,000
Securities remaining and available for future issuances (in shares)			5,576,623
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares to be issued (in shares)	1,000,000