v3.6.0.2
UNAUDITED SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue:                      
Product $ 32,887 $ 31,691 $ 39,536 $ 32,456 $ 38,920 $ 36,130 $ 30,751 $ 20,480 $ 136,570 $ 126,281 $ 120,507
Software subscription and services 8,810 8,678 8,095 7,672 7,306 6,650 6,085 5,337 33,255 25,378 16,785
Total revenue 41,697 40,369 47,631 40,128 46,226 42,780 36,836 25,817 169,825 151,659 137,292
Cost of revenue                      
Product 10,309 10,070 12,413 10,439 12,362 11,707 9,619 6,808 43,231 40,496 38,365
Software subscription and services 3,018 3,095 3,050 2,903 2,857 2,686 2,526 1,828 12,066 9,897 6,400
Total cost of revenue 13,327 13,165 15,463 13,342 15,219 14,393 12,145 8,636 55,297 50,393 44,765
Gross profit 28,370 27,204 32,168 26,786 31,007 28,387 24,691 17,181 114,528 101,266 92,527
Operating expenses:                      
Research and development 10,047 10,685 10,562 10,210 10,433 10,098 8,883 7,510 41,504 36,924 27,546
Sales and marketing 18,961 19,647 21,322 21,068 21,035 21,364 20,195 18,495 80,998 81,089 70,846
General and administrative 6,704 6,515 7,725 7,895 6,638 7,212 6,206 6,247 28,839 26,303 21,180
Operating loss (7,342) (9,643) (7,441) (12,387) (7,099) (10,287) (10,593) (15,071) (36,813) (43,050) (27,045)
Interest income 123 109 117 119 54 21 19 14 468 108 37
Interest expense (123) (115) (110) (126) (142) (140) (173) (754) (474) (1,209) (1,843)
Other income, net 49 22 90 16 72 59 19 135 177 285 255
Loss before income taxes (7,293) (9,627) (7,344) (12,378) (7,115) (10,347) (10,728) (15,676) (36,642) (43,866) (28,596)
Provision for income taxes (29) 85 68 145 (70) 215 99 108 269 352 441
Net loss $ (7,264) $ (9,712) $ (7,412) $ (12,523) $ (7,045) $ (10,562) $ (10,827) $ (15,784) $ (36,911) $ (44,218) $ (29,037)