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Share-based compensation (Tables)
9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
A summary of the Company’s employee’s restricted stock as of September 30, 2013 is presented below:
 
 
 
 
 
Weighted
 
 
 
 
 
average grant
 
 
 
Number of
 
date fair
 
 
 
shares
 
value
 
Non-vested at December 31, 2012
 
314,667
 
$
5.20
 
Granted
 
6,000
 
 
3.68
 
Vested
 
(139,333)
 
 
5.34
 
Forfeited
 
(4,667)
 
 
4.61
 
Non-vested at September 30, 2013
 
176,667
 
$
5.05
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The Company has recorded the following amounts related to its share-based compensation expense in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss:
 
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
 
2013
 
2012
 
2013
 
2012
 
Selling, general and administrative
 
$
349
 
$
220
 
$
1,052
 
$
442
 
Research and development
 
 
 
 
 
 
 
 
7
 
 
 
$
349
 
$
220
 
$
1,052
 
$
449
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
The following table summarizes information about warrants outstanding at September 30, 2013:
 
 
 
 
 
Weighted average
 
 
 
Number of warrants
 
exercise price
 
Warrants outstanding at December 31, 2012
 
4,038,753
 
$
3.68
 
Issued
 
 
 
 
Exercised
 
(2,504,432)
 
 
3.73
 
Expired
 
 
 
 
Warrants outstanding at September 30, 2013
 
1,534,321
 
$
3.60