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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Income or Loss Per Share
Net loss per share was determined as follows (in thousands, except per share amounts):
 
 
Year Ended 
 December 31,
 
 
2013
 
2012
 
2011
Numerator:
 
 
 
 
 
 
Net loss
 
$
(40,996
)
 
$
(41,411
)
 
$
(29,670
)
Denominator:
 
 
 
 
 
 
Weighted-average ordinary shares outstanding
 
18,615

 
14,593

 
14,497

Basic and diluted net loss per share
 
$
(2.20
)
 
$
(2.84
)
 
$
(2.05
)
Ordinary Shares Equivalent Not Included in Diluted Net Loss Per Share
The equivalent ordinary shares not included in diluted net loss per share because their effect would be anti-dilutive are as follows (in thousands):
 
 
Year Ended December 31,
 
2013

2012
 
2011
Stock options to purchase ordinary shares
1,974

 
1,005

 
824

Restricted stock units
—

 
—

 
292

Total
1,974

 
1,005

 
1,116