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Selected Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Consolidated Statements of Operations
The following unaudited quarterly consolidated statements of operations for each of the quarters in the years ended December 31, 2013 and 2012 have been prepared on a basis consistent with the Company’s audited annual financial statements and include, in the opinion of management, all normal recurring adjustments necessary for the fair statement of the financial information contained in these statements.
 
Quarter Ended
 
(in thousands, except per share data)
 
Mar. 31,
2012
 
June 30,
2012
 
Sept. 30,
2012
 
Dec. 31,
2012
 
Mar. 31,
2013
 
June 30,
2013
 
Sept. 30,
2013
 
Dec. 31,
2013
Revenue
$
24,002

 
$
26,718

 
$
30,768

 
$
36,426

 
$
37,657

 
$
44,346

 
$
48,270

 
$
54,856

Cost of revenue
6,844

 
7,890

 
9,135

 
10,722

 
11,252

 
13,164

 
13,644

 
15,488

Gross profit
17,158

 
18,828

 
21,633

 
25,704

 
26,405

 
31,182

 
34,626

 
39,368

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Sales and marketing
16,237

 
17,422

 
18,624

 
21,280

 
23,010

 
26,274

 
28,601

 
31,852

Research and development
3,093

 
3,431

 
4,101

 
4,261

 
4,419

 
5,232

 
5,716

 
5,893

General and administrative
5,954

 
5,792

 
6,600

 
7,566

 
8,566

 
7,530

 
8,261

 
9,215

Amortization of certain acquired intangible assets
—

 
237

 
251

 
251

 
251

 
251

 
251

 
251

Total operating expenses
25,284

 
26,882

 
29,576

 
33,358

 
36,246

 
39,287

 
42,829

 
47,211

Loss from operations
(8,126
)
 
(8,054
)
 
(7,943
)
 
(7,654
)
 
(9,841
)
 
(8,105
)
 
(8,203
)
 
(7,843
)
Other income (expense):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income (expense) and other income (expense), net
96

 
(514
)
 
18

 
(2
)
 
(92
)
 
(714
)
 
(2,747
)
 
(3,009
)
Loss before income tax (provision) benefit
(8,030
)
 
(8,568
)
 
(7,925
)
 
(7,656
)
 
(9,933
)
 
(8,819
)
 
(10,950
)
 
(10,852
)
Income tax (provision) benefit
(82
)
 
334

 
298

 
239

 
(1
)
 
136

 
(104
)
 
97

Net loss
$
(8,112
)
 
$
(8,234
)
 
$
(7,627
)
 
$
(7,417
)
 
$
(9,934
)
 
$
(8,683
)
 
$
(11,054
)
 
$
(10,755
)
Net loss per share, basic and diluted
$
(0.16
)
 
$
(0.17
)
 
$
(0.15
)
 
$
(0.15
)
 
$
(0.20
)
 
$
(0.17
)
 
$
(0.21
)
 
$
(0.21
)
Weighted average common shares outstanding, basic and diluted
49,384

 
49,763

 
50,163

 
50,486

 
50,798

 
51,153

 
51,544

 
52,185