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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Outstanding equity awards not included in calculation of diluted net loss per share
Outstanding equity awards not included in the calculation of diluted net loss per share because their effect was anti-dilutive were as follows:
 
 
June 30, 2011
 
June 30, 2012
 
Number of
Potential
Shares
 
Range of
Exercise Prices
 
Number of
Potential
Shares
 
Range of
Exercise Prices
Stock options
7,254,690

 
$0.47 - $16.36

 
9,298,263

 
$0.47 - $16.36

Unvested stock awards
2,303,779

 
$
—

 
1,132,568

 
$
—

Warrants
1,602,489

 
$
2.40

 
1,602,489

 
$
2.40