| 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.
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