Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Significant Accounting Policies Share-Based Compensation Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table summarizes the weighted-average valuation assumptions and weighted-average grant date fair value of options granted during the periods shown below:

		Year Ended December 31,
		2012		2011
Assumptions (weighted average)
Volatility		98%		85%
Expected term (in years)		4.5		4.0
Risk-free rate		0.6%		1.3%
Expected dividends		0.0%		0.0%
Pre-vest forfeiture rate		8.5%		7.5%
Grant date fair value of options granted	$	1.39	$	6.10

Options activity and positions

Options Activity and Positions

The following table summarizes activity and positions with respect to options for the two years ended December 31, 2012:

				Weighted
				Average
			Weighted	Remaining
			Average	Contractual		Aggregate
			Exercise	Term		Intrinsic
Options	Shares		Price	(years)		Value
Outstanding as of December 31, 2010	1,092,000	$	27.20	5.9	$	96,309
Granted	121,000		10.00
Exercised	(5,000)		15.12
Forfeited or expired	(244,000)		31.60
Outstanding as of December 31, 2011	964,000		24.00	5.8		-
Granted	671,000		1.97
Exercised	(16,000)		1.80
Forfeited or expired	(301,000)		21.20
Outstanding as of December 31, 2012	1,318,000	$	13.71	6.8	$	61,871
Vested and expected to vest as of December 31, 2012	1,285,000	$	13.97	6.7	$	59,481
Exercisable as of December 31, 2012	777,000	$	20.34	5.4	$	20,444