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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
 
Three Months Ended
 
 
Mar. 31,
2012
 
Jun. 30,
2012
 
Sep. 30,
2012
 
Dec. 31,
2012
 
Mar. 31,
2013
 
Jun. 30,
2013
 
Sep. 30, 2013
 
Dec. 31, 2013
 
 
(unaudited)
 
 
(in thousands, except per share data)
Revenues
 
$
21,191

 
$
22,190

 
$
23,382

 
$
24,657

 
$
24,883

 
$
26,291

 
$
27,749

 
$
29,039

Cost of revenues
 
4,160

 
4,629

 
4,634

 
4,981

 
5,795

 
5,924

 
6,415

 
6,526

Gross profit
 
17,031

 
17,561

 
18,748

 
19,676

 
19,088

 
20,367

 
21,334

 
22,513

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Research and development
 
5,101

 
5,148

 
5,076

 
4,870

 
5,297

 
5,291

 
5,151

 
5,939

Sales and marketing
 
9,246

 
9,784

 
8,797

 
9,911

 
10,168

 
10,160

 
10,411

 
11,784

General and administrative
 
2,814

 
2,843

 
3,154

 
3,268

 
3,896

 
4,053

 
4,277

 
4,566

Total operating expenses
 
17,161

 
17,775

 
17,027

 
18,049

 
19,361

 
19,504

 
19,839

 
22,289

Income (loss) from operations
 
(130
)
 
(214
)
 
1,721

 
1,627

 
(273
)
 
863

 
1,495

 
224

Other income (expense), net
 
(77
)
 
(141
)
 
23

 
(171
)
 
(260
)
 
102

 
24

 
(51
)
Income (loss) before provision for (benefit from) income taxes
 
(207
)
 
(355
)
 
1,744

 
1,456

 
(533
)
 
965

 
1,519

 
173

Provision for (benefit from) income taxes(1)
 
78

 
(78
)
 
77

 
281

 
70

 
92

 
210

 
128

Net income (loss)
 
$
(285
)
 
$
(277
)
 
$
1,667

 
$
1,175

 
$
(603
)
 
$
873

 
$
1,309

 
$
45

Net income (loss) attributable to common stockholders
 
$
(285
)
 
$
(277
)
 
$
415

 
$
1,159

 
$
(603
)
 
$
872

 
$
1,308

 
$
45

Net income (loss) per share attributable to common stockholders:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
(0.05
)
 
$
(0.05
)
 
$
0.07

 
$
0.04

 
$
(0.02
)
 
$
0.03

 
$
0.04

 
$
0.00

Diluted
 
$
(0.05
)
 
$
(0.05
)
 
$
0.06

 
$
0.03

 
$
(0.02
)
 
$
0.02

 
$
0.04

 
$
0.00



(1) Includes a benefit from income taxes in the three months ended June 30, 2012 primarily resulting from reductions in the liability for uncertain tax positions due to the lapse of the statute of limitations or closure of tax years due to a completed audit of our French subsidiary. Provision in other periods consist primarily of taxes on income in foreign jurisdictions and state income taxes in the United States.