Equity Plans and Share-Based Compensation (Schedule of stock option activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Option Shares
Outstanding, beginning balance (in shares)	1,220	1,446	1,516
Granted (in shares)	785	45	1,295
Exercised (in shares)	(48)	(14)	(57)
Forfeited (in shares)	(409)	(257)	(1,308)
Outstanding, ending balance (in shares)	1,548	1,220	1,446	1,516
Exercisable, ending balance (in shares)	596
Weighted Average Remaining Contractual Life in Years
Outstanding, beginning balance (in dollars per share)	$ 2.54	$ 2.58	$ 5.14
Granted (in dollars per share)	$ 0.66	$ 0.80	$ 1.88
Exercised (in dollars per share)	$ 0.68	$ 0.68	$ 0.10
Forfeited (in dollars per share)	$ 2.04	$ 2.54	$ 4.96
Outstanding, ending balance (in dollars per share)	$ 1.78	$ 2.54	$ 2.58	$ 5.14
Exercisable, ending balance (in dollars per share)	$ 3.21
Outstanding, Weighted Average Remaining Contractual Life	7 years 9 months 22 days	7 years 9 months 15 days	8 years 9 months 7 days	8 years 3 months 26 days
Exercisable, Weighted Average Remaining Contractual Life	6 years 4 months 21 days
Outstanding, Aggregate Intrinsic Value	$ 51,160	$ 8,057	$ 4,437	$ 527,463
Granted, Aggregate Intrinsic Value	5,400	14,081	149,007
Exercisable, Aggregate Intrinsic Value	$ 12,742