(8) Share-Based Payment Arrangements (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012
Notes to Financial Statements
Number of Options Outstanding, Beginning	14,456,722
Number of Options Granted	2,042,700
Number of Options Exercised	(321,260)
Number of Options Forfeited	(3,550,825)
Number of Options Expired	(1,266,495)
Number of Options Outstanding, Ending	11,360,842
Number of Options Exercisable	7,299,451
Number of Options Expected to Vest after end of period	3,338,779	[1]
Weighted Average Exercise Price Outstanding, Beginning	$ 4.95
Weighted Average Exercise Price Granted	$ 2.45
Weighted Average Exercise Price Exercised	$ 2.30
Weighted Average Exercise Price Forfeited	$ 4.79
Weighted Average Exercise Price Expired	$ 4.62
Weighted Average Exercise Price Outstanding, Ending	$ 4.66
Weighted Average Exercise Price Exercisable	$ 5.60
Weighted Average Exercise Price Expected to Vest After End of Period	$ 3.00	[1]
Weighted Average Remaining Contractual Life (in years) Outstanding	6 years 5 months 20 days
Weighted Average Remaining Contractual Life (in years) Exercisable	5 years 2 months 18 days
Weighted Average Remaining Contractual Life (in years) Expected to Vest after end of period	8 years 8 months 7 days	[1]
Aggregate Intrinsic Value Outstanding, Ending	$ 497,695
Aggregate Intrinsic Value Exercisable	88,120
Aggregate Intrinsic Value Exercisable Options Expected to Vest after end of period	$ 311,277

[1] (1) Options expected to vest after December 31, 2012 reflect an estimated forfeiture rate