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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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,
2016
 
June 30,
2016
 
Sept. 30,
2016
 
Dec. 31,
2016
 
Mar. 31,
2017
 
June 30,
2017
 
Sept. 30,
2017
 
Dec. 31,
2017
Total revenue
$
59,043

 
$
64,423

 
$
67,846

 
$
69,794

 
$
74,194

 
$
85,988

 
$
89,962

 
$
88,793

Total cost of revenue
21,116

 
25,183

 
26,366

 
26,715

 
26,635

 
29,835

 
31,833

 
27,885

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income
$
2,738

 
$
1,873

 
$
2,567

 
$
2,976

 
$
3,963

 
$
9,865

 
$
15,103

 
$
320

Net income / (loss) per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.06

 
$
0.04

 
$
0.06

 
$
0.06

 
$
0.09

 
$
0.21

 
$
0.32

 
$
0.01

Diluted
$
0.06

 
$
0.04

 
$
0.05

 
$
0.06

 
$
0.08

 
$
0.20

 
$
0.31

 
$
0.01