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Net Income (Loss) Per Share (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]    
Calculations of net loss per share
The table below shows the calculations for the three and nine months ended September 30, 2017 and 2016.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands, except for per share data)
2017
 
2016
 
2017
 
2016
Numerator (both basic and diluted)
 
 
 
 
 
 
 
Net income (loss) relevant to common stockholders
$
21,965

 
$
(13,598
)
 
$
2,535

 
$
(35,830
)
Denominator
 
 
 
 
 
 
 
Denominator for basic income (loss) per share
83,040

 
52,975

 
74,124

 
42,526

Dilutive effect of stock options
2,808

 
—

 
2,822

 
—

Dilutive effect of performance stock units
37

 
—

 
—

 
—

Dilutive effect of non-vested restricted stock
379

 
—

 
172

 
—

Denominator for diluted income (loss) per share
86,264

 
52,975

 
77,118

 
42,526

Basic income (loss) per common share
$
0.26

 
$
(0.26
)
 
$
0.03

 
$
(0.84
)
Diluted income (loss) per common share
$
0.25

 
$
(0.26
)
 
$
0.03

 
$
(0.84
)
The table below shows the calculations for years ended December 31, 2016 and 2015.
 
2016
 
2015
Numerator (both basic and diluted)
 
 
 
Net loss relevant to common stockholders
$
(53,147,396
)
 
$
(45,852,684
)
Denominator
 
 
 
Denominator for basic earnings (loss) per share
44,786,687

 
34,992,662

Denominator for diluted earnings (loss) per share
44,786,687

 
34,992,662

Basic loss per common share
$
(1.19
)
 
$
(1.31
)
Diluted loss per common share
$
(1.19
)
 
$
(1.31
)
Anti-dilutive shares excluded from diluted earnings (loss) per share calculation
As shown in the table below, the following non-vested restricted stock, performance stock units, and stock options have not been included in the calculation of diluted income (loss) per share as they would be anti-dilutive to the calculation above.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
2017
 
2016
 
2017
 
2016
Stock options
789

 
4,646

 
789

 
4,646

Performance stock units
—

 
—

 
170

 
—

Non-vested restricted stock
—

 
372

 
318

 
372

 
789

 
5,018

 
1,277

 
5,018
The Company also has non‑vested restricted stock and stock options as shown in the table below, but have not been included in the above calculation of diluted earnings (loss) per share as it would be anti‑dilutive to the calculation above. Additionally, we excluded the preferred stock in the net loss per share calculation because the holders do not have a participating right in the undistributed earnings (loss) of the Company.
 
2016
 
2015
Stock options
4,645,884

 
3,485,791

Preferred stock
16,999,990

 
—

Non‑vested restricted stock
372,335

 
372,335

 
22,018,209

 
3,858,126