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Summary of Significant Accounting Policies Computation of Basic and Diluted Net loss per share (Tables)
 12 Months Ended
Dec. 31, 2012
Computation of Basic and Diluted net loss Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following is a reconciliation of the numerators and denominators of the basic and diluted net loss per share computations for the years ended December 31, 2012, 2011 and 2010 (in thousands, except per share amounts):
 
Year ended 31 December
 
2012
 
2011
 
2010
Net loss (Numerator):
 
 
 
 
 
Net loss, basic & diluted
$
(12,818
)
 
$
(13,000
)
 
$
(31,312
)
Shares (Denominator):
 
 
 
 
 
Weighted average common shares outstanding
42,650

 
42,083

 
41,365

Shares used in basic computation
42,650

 
42,083

 
41,365

Common shares issuable upon exercise of stock options (treasury stock method)
—

 
—

 
—

Shares used in diluted computation
42,650

 
42,083

 
41,365

Net loss per share:
 
 
 
 
 
Basic
$
(0.30
)
 
$
(0.31
)
 
$
(0.76
)
Diluted
$
(0.30
)
 
$
(0.31
)
 
$
(0.76
)