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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (Unaudited) | 13. Selected Quarterly Financial Data (Unaudited) Selected quarterly financial information for 2016 and 2015 is as follows:
|  | Quarter Ended
|  | Dec. 31, 2016 |  | Sept. 30, 2016 |  | Jun. 30, 2016 |  | Mar. 31, 2016 |  | Dec. 31, 2015 |  | Sept. 30, 2015 |  | Jun. 30, 2015 |  | Mar. 31, 2015
|  | (unaudited, in thousands, except per share data)
Revenue |  | $ | 44,207 |  |  | $ | 40,982 |  |  | $ | 38,886 |  |  | $ | 38,015 |  |  | $ | 36,033 |  |  | $ | 32,287 |  |  | $ | 30,274 |  |  | $ | 30,274 |
Cost of revenue (1)(2) |  | 15,770 |  |  | 17,790 |  |  | 16,764 |  |  | 16,610 |  |  | 15,635 |  |  | 14,812 |  |  | 14,270 |  |  | 14,778 |
Gross profit |  | 28,437 |  |  | 23,192 |  |  | 22,122 |  |  | 21,405 |  |  | 20,398 |  |  | 17,475 |  |  | 16,004 |  |  | 15,496 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development (1)(2) |  | 6,236 |  |  | 6,041 |  |  | 5,799 |  |  | 5,802 |  |  | 5,580 |  |  | 5,473 |  |  | 5,568 |  |  | 6,038 |
Sales and marketing (1)(2) |  | 14,480 |  |  | 12,925 |  |  | 12,637 |  |  | 12,706 |  |  | 10,720 |  |  | 10,797 |  |  | 10,594 |  |  | 9,931 |
General and administrative (1)(2) |  | 6,511 |  |  | 6,143 |  |  | 5,882 |  |  | 6,536 |  |  | 6,433 |  |  | 6,087 |  |  | 6,027 |  |  | 7,275 |
Total operating expenses |  | 27,227 |  |  | 25,109 |  |  | 24,318 |  |  | 25,044 |  |  | 22,733 |  |  | 22,357 |  |  | 22,189 |  |  | 23,244 |
Loss from operations |  | 1,210 |  |  | (1,917 | ) |  | (2,196 | ) |  | (3,639 | ) |  | (2,335 | ) |  | (4,882 | ) |  | (6,185 | ) |  | (7,748 | )
Other income (expense), net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | (869 | ) |  | (961 | ) |  | (1,197 | ) |  | (1,199 | ) |  | (1,198 | ) |  | (1,235 | ) |  | (1,155 | ) |  | (1,139 | )
Extinguishment of debt |  | — |  |  | (1,026 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Interest income and other |  | 54 |  |  | 12 |  |  | (33 | ) |  | (45 | ) |  | 28 |  |  | 119 |  |  | (49 | ) |  | 2 |
Total other income (expense), net |  | (815 | ) |  | (1,975 | ) |  | (1,230 | ) |  | (1,244 | ) |  | (1,170 | ) |  | (1,116 | ) |  | (1,204 | ) |  | (1,137 | )
Income (loss) before income taxes |  | 395 |  |  | (3,892 | ) |  | (3,426 | ) |  | (4,883 | ) |  | (3,505 | ) |  | (5,998 | ) |  | (7,389 | ) |  | (8,885 | )
Provision for (benefit from) income taxes |  | (14 | ) |  | (2 | ) |  | 42 |  |  | 28 |  |  | 13 |  |  | 50 |  |  | (20 | ) |  | 18 |
Net income (loss) |  | $ | 409 |  |  | $ | (3,890 | ) |  | $ | (3,468 | ) |  | $ | (4,911 | ) |  | $ | (3,518 | ) |  | $ | (6,048 | ) |  | $ | (7,369 | ) |  | $ | (8,903 | )
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.01 |  |  | $ | (0.07 | ) |  | $ | (0.07 | ) |  | $ | (0.10 | ) |  | $ | (0.07 | ) |  | $ | (0.12 | ) |  | $ | (0.15 | ) |  | $ | (0.18 | )
Diluted |  | $ | 0.01 |  |  | $ | (0.07 | ) |  | $ | (0.07 | ) |  | $ | (0.10 | ) |  | $ | (0.07 | ) |  | $ | (0.12 | ) |  | $ | (0.15 | ) |  | $ | (0.18 | )
Shares used in computing net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 53,126 |  |  | 52,708 |  |  | 52,143 |  |  | 51,377 |  |  | 50,764 |  |  | 50,369 |  |  | 49,980 |  |  | 49,433 |
Diluted |  | 56,633 |  |  | 52,708 |  |  | 52,143 |  |  | 51,377 |  |  | 50,764 |  |  | 50,369 |  |  | 49,980 |  |  | 49,433 |
(1) Included stock-based compensation as follows:
|  | Quarter Ended
|  | Dec. 31, 2016 |  | Sept. 30, 2016 |  | Jun. 30, 2016 |  | Mar. 31, 2016 |  | Dec. 31, 2015 |  | Sept. 30, 2015 |  | Jun. 30, 2015 |  | Mar. 31, 2015
|  | (unaudited, in thousands)
Cost of revenue |  | $ | 424 |  |  | $ | 357 |  |  | $ | 329 |  |  | $ | 265 |  |  | $ | 227 |  |  | $ | 233 |  |  | $ | 218 |  |  | $ | 188 |
Research and development |  | 549 |  |  | 547 |  |  | 528 |  |  | 435 |  |  | 401 |  |  | 475 |  |  | 340 |  |  | 574 |
Sales and marketing |  | 759 |  |  | 626 |  |  | 544 |  |  | 434 |  |  | 370 |  |  | 448 |  |  | 458 |  |  | 524 |
General and administrative |  | 984 |  |  | 989 |  |  | 1,013 |  |  | 860 |  |  | 722 |  |  | 789 |  |  | 814 |  |  | 949 |
Total stock-based compensation |  | $ | 2,716 |  |  | $ | 2,519 |  |  | $ | 2,414 |  |  | $ | 1,994 |  |  | $ | 1,720 |  |  | $ | 1,945 |  |  | $ | 1,830 |  |  | $ | 2,235 |
(2) Included depreciation and amortization expenses as follows:
|  | Quarter Ended
|  | Dec. 31, 2016 |  | Sept. 30, 2016 |  | Jun. 30, 2016 |  | Mar. 31, 2016 |  | Dec. 31, 2015 |  | Sept. 30, 2015 |  | Jun. 30, 2015 |  | Mar. 31, 2015
|  | (unaudited, in thousands)
Cost of revenue |  | $ | 1,608 |  |  | $ | 1,668 |  |  | $ | 1,616 |  |  | $ | 1,680 |  |  | $ | 1,483 |  |  | $ | 1,470 |  |  | $ | 1,558 |  |  | $ | 1,439 |
Research and development |  | 224 |  |  | 204 |  |  | 161 |  |  | 148 |  |  | 140 |  |  | 126 |  |  | 102 |  |  | 87 |
Sales and marketing |  | 58 |  |  | 56 |  |  | 54 |  |  | 53 |  |  | 54 |  |  | 52 |  |  | 51 |  |  | 49 |
General and administrative |  | 196 |  |  | 212 |  |  | 229 |  |  | 222 |  |  | 186 |  |  | 192 |  |  | 199 |  |  | 200 |
Total depreciation and amortization |  | $ | 2,086 |  |  | $ | 2,140 |  |  | $ | 2,060 |  |  | $ | 2,103 |  |  | $ | 1,863 |  |  | $ | 1,840 |  |  | $ | 1,910 |  |  | $ | 1,775 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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