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Selected Quarterly Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Data (Unaudited)
SELECTED QUARTERLY DATA (UNAUDITED)
The following unaudited quarterly consolidated statements of operations for each of the quarters in the years ended December 31, 2017 and 2016 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,
2016
 
June 30,
2016
 
Sept. 30,
2016
 
Dec. 31,
2016
 
Mar. 31,
2017
 
June 30,
2017
 
Sept. 30,
2017
 
Dec. 31,
2017
Revenue
$
99,324

 
$
107,013

 
$
107,758

 
$
109,029

 
$
111,582

 
$
116,651

 
$
121,796

 
$
131,956

Cost of revenue
31,650

 
35,955

 
33,369

 
34,778

 
33,949

 
35,321

 
35,708

 
37,889

Gross profit
67,674

 
71,058

 
74,389

 
74,251

 
77,633

 
81,330

 
86,088

 
94,067

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Sales and marketing
56,701

 
57,835

 
53,690

 
57,405

 
56,894

 
62,073

 
60,554

 
60,750

Research and development
11,015

 
11,782

 
12,130

 
12,050

 
13,411

 
14,684

 
16,389

 
17,491

General and administrative
16,465

 
16,538

 
18,608

 
19,345

 
20,476

 
23,141

 
21,249

 
19,723

Restructuring
—

 
—

 
—

 
—

 
—

 
—

 
—

 
1,539

Amortization of certain acquired intangible assets
150

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total operating expenses
84,331

 
86,155

 
84,428

 
88,800

 
90,781

 
99,898

 
98,192

 
99,503

Loss from operations
(16,657
)
 
(15,097
)
 
(10,039
)
 
(14,549
)
 
(13,148
)
 
(18,568
)
 
(12,104
)
 
(5,436
)
Other income (expense):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income (expense) and other income (expense), net
(1,051
)
 
(2,350
)
 
(2,131
)
 
(3,756
)
 
(2,492
)
 
(2,333
)
 
(2,248
)
 
(3,260
)
Loss before income tax provision
(17,708
)
 
(17,447
)
 
(12,170
)
 
(18,305
)
 
(15,640
)
 
(20,901
)
 
(14,352
)
 
(8,696
)
Income tax provision
(535
)
 
(141
)
 
(218
)
 
(313
)
 
(571
)
 
(364
)
 
(503
)
 
(308
)
Net loss
$
(18,243
)
 
$
(17,588
)
 
$
(12,388
)
 
$
(18,618
)
 
$
(16,211
)
 
$
(21,265
)
 
$
(14,855
)
 
$
(9,004
)
Net loss per share, basic and diluted
$
(0.33
)
 
$
(0.32
)
 
$
(0.22
)
 
$
(0.33
)
 
$
(0.29
)
 
$
(0.37
)
 
$
(0.26
)
 
$
(0.16
)
Weighted average common shares outstanding, basic and diluted
54,827

 
55,278

 
55,964

 
56,300

 
56,642

 
56,935

 
57,627

 
57,826