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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The following table sets forth the computation of basic and diluted net income (loss) per share for the periods ended:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands, except per share amounts)
Basic net income (loss) attributable to Vertex per common share calculation:
 
 
 
 
 
 
 
Net income (loss) attributable to Vertex common shareholders
$
128,746

 
$
(102,952
)
 
$
546,369

 
$
162,800

Less: Undistributed earnings allocated to participating securities
(14
)
 
—

 
(161
)
 
(203
)
Net income (loss) attributable to Vertex common shareholders—basic
$
128,732

 
$
(102,952
)
 
$
546,208

 
$
162,597

 
 
 
 
 
 
 
 
Basic weighted-average common shares outstanding
254,905

 
250,268

 
254,096

 
247,963

Basic net income (loss) attributable to Vertex per common share
$
0.51

 
$
(0.41
)
 
$
2.15

 
$
0.66

 
 
 
 
 
 
 
 
Diluted net income (loss) attributable to Vertex per common share calculation:
 
 
 
 
 
 
 
Net income (loss) attributable to Vertex common shareholders
$
128,746

 
$
(102,952
)
 
$
546,369

 
$
162,800

Less: Undistributed earnings allocated to participating securities
(13
)
 
—

 
(158
)
 
(200
)
Net income (loss) attributable to Vertex common shareholders—diluted
$
128,733

 
$
(102,952
)
 
$
546,211

 
$
162,600

 
 
 
 
 
 
 
 
Weighted-average shares used to compute basic net income (loss) per common share
254,905

 
250,268

 
254,096

 
247,963

Effect of potentially dilutive securities:
 
 
 
 
 
 
 
Stock options
2,962

 
—

 
2,990

 
2,700

Restricted stock and restricted stock units (including PSUs)
1,896

 
—

 
1,866

 
1,204

Employee stock purchase program
25

 
—

 
20

 
228

Weighted-average shares used to compute diluted net income (loss) per common share
259,788

 
250,268

 
258,972

 
252,095

Diluted net income (loss) attributable to Vertex per common share
$
0.50

 
$
(0.41
)
 
$
2.11

 
$
0.64
Potential gross common equivalent shares
The Company did not include the securities in the following table in the computation of the net income (loss) per share attributable to Vertex common shareholders calculations because the effect would have been anti-dilutive during each period:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Stock options
2,572

 
10,278

 
2,152

 
3,904

Unvested restricted stock and restricted stock units (including PSUs)
1

 
4,241

 
4

 
281