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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited)
NOTE 11.
Quarterly Financial Information (Unaudited)

The following table sets forth unaudited consolidated statements of operations data for each of the quarters in the two-year period ended December 31, 2016. The unaudited quarterly consolidated statements of operations data set forth below have been prepared on the same basis as the audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K and, in the opinion of management, reflect all necessary adjustments, which consist only of normal recurring adjustments, necessary for a fair presentation of such data. Historical results are not necessarily indicative of the results for the full year or any other period. This data should be read together with the consolidated financial statements and the related notes included elsewhere in this Annual Report on Form 10-K.
 
 
Three Months Ended
 
Mar. 31,
2015
 
Jun. 30,
2015
 
Sep. 30, 2015
 
Dec 31, 2015
 
Mar. 31,
2016
 
Jun. 30,
2016
 
Sep. 30, 2016
 
Dec 31, 2016
 
(unaudited)
 
(in thousands, except per share data)
Revenues
$
37,493

 
$
39,877

 
$
42,469

 
$
44,445

 
$
46,248

 
$
48,466

 
$
50,987

 
$
52,224

Cost of revenues
7,964

 
8,157

 
8,762

 
9,002

 
9,416

 
10,092

 
11,288

 
11,677

Gross profit
29,529

 
31,720

 
33,707

 
35,443

 
36,832

 
38,374

 
39,699

 
40,547

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Research and development
7,150

 
7,205

 
7,564

 
7,532

 
7,834

 
9,143

 
9,405

 
8,885

Sales and marketing
11,443

 
12,776

 
12,282

 
13,068

 
13,933

 
14,451

 
14,240

 
15,346

General and administrative
6,016

 
6,427

 
6,983

 
7,147

 
7,468

 
9,068

 
8,067

 
7,505

Total operating expenses
24,609

 
26,408

 
26,829

 
27,747

 
29,235

 
32,662

 
31,712

 
31,736

Income from operations
4,920

 
5,312

 
6,878

 
7,696

 
7,597

 
5,712

 
7,987

 
8,811

Other income (expense), net
(77
)
 
128

 
(154
)
 
(183
)
 
168

 
40

 
230

 
(116
)
Income before income taxes
4,843

 
5,440

 
6,724

 
7,513

 
7,765

 
5,752

 
8,217

 
8,695

Provision for income taxes
1,841

 
2,124

 
2,601

 
2,089

 
2,982

 
2,214

 
3,221

 
2,788

Net income
$
3,002

 
$
3,316

 
$
4,123

 
$
5,424

 
$
4,783

 
$
3,538

 
$
4,996

 
$
5,907

Net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.10

 
$
0.12

 
$
0.16

 
$
0.14

 
$
0.10

 
$
0.14

 
$
0.17

Diluted
$
0.08

 
$
0.09

 
$
0.11

 
$
0.14

 
$
0.13

 
$
0.09

 
$
0.13

 
$
0.15