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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Unaudited Quarterly Financial Information
The selected consolidated statements of operation data in amounts are presented below (in thousands, except per share data):
 
Three Months Ended
 
Mar. 31,
2017
 
June 30,
2017
 
Sept. 30,
2017
 
Dec. 31,
2017
 
Mar. 31,
2018
 
June 30,
2018
 
Sept. 30,
2018
 
Dec. 31,
2018
Total revenue
$
74,194

 
$
85,988

 
$
89,962

 
$
88,793

 
$
92,756

 
$
104,488

 
$
111,848

 
$
111,402

Total cost of revenue
26,635

 
29,835

 
31,833

 
27,885

 
28,377

 
36,488

 
41,992

 
38,858

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income / (loss)
3,963

 
9,865

 
15,103

 
320

 
10,515

 
10,733

 
(7,652
)
 
7,928

Net income / (loss) per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.21

 
$
0.32

 
$
0.01

 
$
0.22

 
$
0.23

 
$
(0.16
)
 
$
0.16

Diluted
$
0.08

 
$
0.20

 
$
0.31

 
$
0.01

 
$
0.21

 
$
0.22

 
$
(0.16
)
 
$
0.16