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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2017
Accounting Policies [Abstract]  
Summary of potential common shares excluded from computations of diluted net loss per share attributed to common stockholders
The following potentially dilutive common shares were excluded from the computation of diluted net loss per share for the interim periods presented because they would have been anti-dilutive (in thousands):
 
 
Three Months Ended March 31,
 
 
2017
 
2016
Stock options, restricted stock units and performance awards
 
5,085

 
4,911

Convertible notes
 
3,598

 
3,598

Total
 
8,683

 
8,509

Summary of comprehensive loss
The components of accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2017 are summarized as follows (in thousands):
 
 
Foreign Currency Translation Adjustment
 
Net Unrealized Gain (Loss) on Securities
 
Accumulated Other Comprehensive Loss
Balance at December 31, 2016
 
$
(758
)
 
$
(2
)
 
$
(760
)
Other comprehensive income
 
34

 
1

 
35

Balance at March 31, 2017
 
$
(724
)
 
$
(1
)
 
$
(725
)