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Unaudited Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following tables set forth selected unaudited quarterly consolidated statement of operations data for each of the quarters indicated as well as the percentage of total revenue for each line item shown. The unaudited information should be read in conjunction with our financial statements and related notes included elsewhere in this report. We believe that the following unaudited information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.
| Three months ended
| Dec 31, 2017 |  | Sep 30, 2017 |  | Jun 30, 2017 |  | Mar 31, 2017 |  | Dec 31, 2016 |  | Sep 30, 2016 |  | Jun 30, 2016 |  | Mar 31, 2016
| (in thousands)
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription and support | $ | 45,549 |  | $ | 43,214 |  | $ | 40,980 |  | $ | 39,540 |  | $ | 38,329 |  | $ | 36,237 |  | $ | 34,969 |  | $ | 33,585
Professional services | 8,957 |  | 8,854 |  | 8,411 |  | 12,364 |  | 8,045 |  | 8,473 |  | 8,042 |  | 10,966
Total revenue | 54,506 |  | 52,068 |  | 49,391 |  | 51,904 |  | 46,374 |  | 44,710 |  | 43,011 |  | 44,551
Cost of revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription and support | 8,779 |  | 8,472 |  | 7,758 |  | 7,637 |  | 7,244 |  | 6,694 |  | 7,039 |  | 6,918
Professional services | 7,310 |  | 7,180 |  | 6,528 |  | 6,581 |  | 5,964 |  | 6,040 |  | 5,538 |  | 6,188
Total cost of revenue | 16,089 |  | 15,652 |  | 14,286 |  | 14,218 |  | 13,208 |  | 12,734 |  | 12,577 |  | 13,106
Gross profit | 38,417 |  | 36,416 |  | 35,105 |  | 37,686 |  | 33,166 |  | 31,976 |  | 30,434 |  | 31,445
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development | 18,870 |  | 17,527 |  | 16,239 |  | 15,536 |  | 14,533 |  | 14,342 |  | 14,047 |  | 14,516
Sales and marketing | 21,949 |  | 23,712 |  | 19,787 |  | 18,713 |  | 18,196 |  | 22,354 |  | 19,828 |  | 20,088
General and administrative (1) | 12,271 |  | 8,959 |  | 8,943 |  | 9,421 |  | 7,845 |  | 8,015 |  | 7,882 |  | 8,953
Total operating expenses | 53,090 |  | 50,198 |  | 44,969 |  | 43,670 |  | 40,574 |  | 44,711 |  | 41,757 |  | 43,557
Loss from operations | (14,673) |  | (13,782) |  | (9,864) |  | (5,984) |  | (7,408) |  | (12,735) |  | (11,323) |  | (12,112)
Interest expense | (451) |  | (464) |  | (475) |  | (455) |  | (455) |  | (462) |  | (468) |  | (490)
Other income, net | 797 |  | 198 |  | 176 |  | 612 |  | 348 |  | 298 |  | 278 |  | 576
Loss before (benefit) provision for income taxes | (14,327) |  | (14,048) |  | (10,163) |  | (5,827) |  | (7,515) |  | (12,899) |  | (11,513) |  | (12,026)
(Benefit) provision for income taxes | (6) |  | 25 |  | 33 |  | 9 |  | 1 |  | (8) |  | 12 |  | 19
Net loss | $ | (14,321) |  | $ | (14,073) |  | $ | (10,196) |  | $ | (5,836) |  | $ | (7,516) |  | $ | (12,891) |  | $ | (11,525) |  | $ | (12,045)
Net loss per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ | (0.34) |  | $ | (0.34) |  | $ | (0.25) |  | $ | (0.14) |  | $ | (0.18) |  | $ | (0.32) |  | $ | (0.28) |  | $ | (0.30)
Weighted-average common shares outstanding - basic and diluted | 42,108,764 |  | 41,815,139 |  | 41,429,691 |  | 41,108,611 |  | 40,872,772 |  | 40,762,960 |  | 40,593,908 |  | 40,451,668
(1) During the fourth quarter of 2017, we recorded an additional $1.9 million to general and administrative expense due to certain severance arrangements.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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=84173487&loc=d3e1280-108306 + Details
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