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UNAUDITED SELECTED QUARTERLY FINANCIAL DATA (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
The following table sets forth the Company’s consolidated statements of operations data for the eight quarters ended December 31, 2015. This unaudited quarterly information has been prepared on the same basis as the Company’s audited consolidated financial statements and, in the opinion of management, includes all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of this data.
 
Three Months Ended
 
Dec 31, 2015
 
Sept 30, 2015
 
June 30, 2015
 
March 31, 2015
 
Dec 31, 2014
 
Sept 30, 2014
 
June 30, 2014
 
March 31, 2014
 
(In thousands)
Revenue:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Product
$
38,920

 
$
36,130

 
$
30,751

 
$
20,480

 
$
31,149

 
$
30,776

 
$
33,721

 
$
24,861

Software subscription and services
7,306

 
6,650

 
6,085

 
5,337

 
5,031

 
4,550

 
3,833

 
3,371

Total revenue
46,226

 
42,780

 
36,836

 
25,817

 
36,180

 
35,326

 
37,554

 
28,232

Cost of revenue:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Product
12,362

 
11,707

 
9,619

 
6,808

 
10,159

 
9,764

 
10,560

 
7,882

Software subscription and services
2,857

 
2,686

 
2,526

 
1,828

 
1,717

 
1,678

 
1,639

 
1,366

Total cost of revenue
15,219

 
14,393

 
12,145

 
8,636

 
11,876

 
11,442

 
12,199

 
9,248

Gross profit
31,007

 
28,387

 
24,691

 
17,181

 
24,304

 
23,884

 
25,355

 
18,984

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Research and development
10,433

 
10,098

 
8,883

 
7,510

 
7,031

 
7,544

 
6,833

 
6,138

Sales and marketing
21,409

 
22,083

 
20,804

 
18,770

 
18,728

 
18,056

 
19,011

 
16,569

General and administrative
6,638

 
7,212

 
6,206

 
6,247

 
5,984

 
5,224

 
5,135

 
4,837

Operating loss
(7,473
)
 
(11,006
)
 
(11,202
)
 
(15,346
)
 
(7,439
)
 
(6,940
)
 
(5,624
)
 
(8,560
)
Interest income
54

 
21

 
19

 
14

 
18

 
10

 
8

 
1

Interest expense
(142
)
 
(140
)
 
(173
)
 
(754
)
 
(461
)
 
(458
)
 
(459
)
 
(465
)
Other income (expense), net
72

 
59

 
19

 
135

 
101

 
95

 
(58
)
 
117

Loss before income taxes
(7,489
)
 
(11,066
)
 
(11,337
)
 
(15,951
)
 
(7,781
)
 
(7,293
)
 
(6,133
)
 
(8,907
)
Income tax provision
70

 
(215
)
 
(99
)
 
(108
)
 
(205
)
 
(81
)
 
(135
)
 
(20
)
Net loss
$
(7,419
)
 
$
(11,281
)
 
$
(11,436
)
 
$
(16,059
)
 
$
(7,986
)
 
$
(7,374
)
 
$
(6,268
)
 
$
(8,927
)