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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 12 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
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue                      
Subscription and support $ 45,549 $ 43,214 $ 40,980 $ 39,540 $ 38,329 $ 36,237 $ 34,969 $ 33,585 $ 169,283 $ 143,120 $ 116,288
Professional services 8,957 8,854 8,411 12,364 8,045 8,473 8,042 10,966 38,586 35,526 28,984
Total revenue 54,506 52,068 49,391 51,904 46,374 44,710 43,011 44,551 207,869 178,646 145,272
Cost of revenue                      
Subscription and support 8,779 8,472 7,758 7,637 7,244 6,694 7,039 6,918 32,646 27,895 22,559
Professional services 7,310 7,180 6,528 6,581 5,964 6,040 5,538 6,188 27,599 23,730 17,645
Total cost of revenue 16,089 15,652 14,286 14,218 13,208 12,734 12,577 13,106 60,245 51,625 40,204
Gross profit 38,417 36,416 35,105 37,686 33,166 31,976 30,434 31,445 147,624 127,021 105,068
Operating expenses                      
Research and development 18,870 17,527 16,239 15,536 14,533 14,342 14,047 14,516 68,172 57,438 50,466
Sales and marketing 21,949 23,712 19,787 18,713 18,196 22,354 19,828 20,088 84,161 80,466 69,569
General and administrative 12,271 8,959 8,943 9,421 7,845 8,015 7,882 8,953 39,594 32,695 28,716
Total operating expenses 53,090 50,198 44,969 43,670 40,574 44,711 41,757 43,557 191,927 170,599 148,751
Loss from operations (14,673) (13,782) (9,864) (5,984) (7,408) (12,735) (11,323) (12,112) (44,303) (43,578) (43,683)
Interest expense (451) (464) (475) (455) (455) (462) (468) (490) (1,845) (1,875) (2,025)
Other income, net 797 198 176 612 348 298 278 576 1,783 1,500 2,302
Loss before provision (benefit) for income taxes (14,327) (14,048) (10,163) (5,827) (7,515) (12,899) (11,513) (12,026) (44,365) (43,953) (43,406)
Provision (benefit) for income taxes (6) 25 33 9 1 (8) 12 19 61 24 (7)
Net loss $ (14,321) $ (14,073) $ (10,196) $ (5,836) $ (7,516) $ (12,891) $ (11,525) $ (12,045) $ (44,426) $ (43,977) $ (43,399)
Net loss per common share:                      
Basic and diluted (in dollars per share) $ (0.34) $ (0.34) $ (0.25) $ (0.14) $ (0.18) $ (0.32) $ (0.28) $ (0.30) $ (1.07) $ (1.08) $ (1.09)
Weighted average common shares outstanding - basic and diluted (in shares) 42,108,764 41,815,139 41,429,691 41,108,611 40,872,772 40,762,960 40,593,908 40,451,668 41,618,838 40,671,133 39,852,624