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Net Income (Loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted net (loss) income per share of common stock
The following table sets forth the computation of basic and diluted net loss per share of common stock attributable to common stockholders:
 
Year Ended
 
December 31,
 
2018

2017
 
2016
 
(in thousands, expect per-share data)
Net income (loss)
$
39,190

 
$
(3,248
)
 
$
(87,182
)
 
 
 
 
 
 
Weighted average common shares outstanding — Basic
13,512

 
12,336

 
12,148

Plus incremental shares from assumed conversions:
 
 
 
 
 
Dilutive effect of stock options
565

 

 

Dilutive effect of unvested awards
31

 

 

Dilutive effect of warrants
181

 

 

Weighted average common shares outstanding — Diluted
14,289

 
12,336

 
12,148

 
 
 
 
 
 
Net earnings (loss) per share :
 
 
 
 
 
Basic
$
2.90

 
$
(0.26
)
 
$
(7.18
)
Diluted
$
2.74

 
$
(0.26
)
 
$
(7.18
)
Schedule of antidilutive securities excluded from computation of diluted net income per share of common stock
The weighted average shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or were otherwise excluded under the treasury stock method. The treasury stock method calculates dilution assuming the exercise of all in-the-money options and vesting of restricted stock, reduced by the repurchase of shares with the proceeds from the assumed exercises, unrecognized compensation expense for outstanding awards and the estimated tax benefit of the assumed exercises.
 
Year Ended
 
December 31,
 
2018
 
2017
 
2016
 
(in thousands)
Stock options
86

 
1,589

 
1,602

Warrants
377

 
765

 
768

Unvested restricted stock awards
107

 
36

 
30

Total
570

 
2,390

 
2,400