Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2015

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,
		2015		2014		2013
Assumptions (weighted-average)
Volatility		98%		100%		96%
Expected term (in years)		4.0		4.0		4.1
Risk-free rate		1.3%		1.3%		1.0%
Expected dividends		0.0%		0.0%		0.0%
Pre-vest forfeiture rate		8.5%		8.5%		8.5%
Grant date fair value of options granted	$	2.20	$	1.22	$	1.49

Options activity and positions

The following table summarizes activity and positions with respect to options for the periods shown below (in thousands):

				Weighted-
				average
			Weighted-	remaining
			average	contractual		Aggregate
			exercise	term		intrinsic
Options	Shares		price	(in years)		value
Outstanding as of December 31, 2012	1,318	$	13.71	6.8	$	-
Granted	824		2.22	-		-
Exercised	(23)		1.80	-		-
Forfeited or expired	(214)		13.86	-		-
Outstanding as of December 31, 2013	1,905		8.86	7.4		1,500
Granted	717		1.78	-		-
Exercised	-		-	-		-
Forfeited or expired	(195)		9.49	-		-
Outstanding as of December 31, 2014	2,427		6.72	7.4		18,700
Granted	849		3.23	-		-
Exercised	(23)		1.88	-		-
Forfeited or expired	(107)		13.98	-		-
Outstanding as of December 31, 2015	3,146	$	5.56	7.3	$	1,613
Vested and expected to vest as of December 31, 2015	2,949	$	5.75	7.2	$	1,539
Exercisable as of December 31, 2015	1,582	$	8.49	5.8	$	906