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LOSS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data):
 
Three Months Ended March 31,
2017
 
2016
Net loss
$
(15,090
)
 
$
(96,755
)
Basic shares:
 
 
 
Weighted-average common shares outstanding
368,571
 
335,177
Weighted-average unvested shares
(1,834
)
 
(3,853
)
Weighted-average shares used to compute basic net loss per share
366,737
 
331,324
Diluted shares:
 
 
 
Weighted-average shares used to compute diluted loss per share
366,737
 
331,324
Net loss per share:
 
 
 
Basic
$
(0.04
)
 
$
(0.29
)
Diluted
$
(0.04
)
 
$
(0.29
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following potential common shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented (in thousands):

 
Three Months Ended March 31,
 
2017
 
2016
Stock options and restricted stock units
80,021

 
109,912

Common stock warrants
19,173

 
9,544

Unvested shares
1,732

 
3,428

Employee stock purchase plan
653

 
635

Total anti-dilutive securities
101,579

 
123,519