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QUARTERLY RESULTS (UNAUDITED) - (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 166,896 $ 152,468 $ 137,361 $ 121,180 $ 146,212 $ 74,629 $ 55,733 $ 53,368      
Cost of revenue 71,182 70,234 62,250 65,907 69,413 20,082 19,331 19,620      
Gross profit 95,714 82,234 75,111 55,273 76,799 54,547 36,402 33,748 $ 308,332 $ 201,496 $ 167,611
(Loss) income from operations 1,177 (7,566) (16,636) (42,383) (35,663) 3,919 (12,703) (10,782) (65,408) (55,229) (13,609)
Net loss $ (1,826) $ (10,158) $ (19,922) $ (44,904) $ (15,714) $ 3,453 $ (12,345) $ (10,646) $ (76,810) $ (35,252) $ (13,932)
Loss per share:                      
Basic (in dollars per share) $ (0.02) $ (0.10) $ (0.20) $ (0.44) $ (0.18) $ 0.07 $ (0.25) $ (0.22) $ (0.74) $ (0.60) $ (0.28)
Diluted (in dollars per share) $ (0.02) $ (0.10) $ (0.20) $ (0.44) $ (0.18) $ 0.07 $ (0.25) $ (0.22) $ (0.74) $ (0.60) $ (0.28)
Shares used in computing loss per share:                      
Basic (in shares) 106,607 104,918 102,160 101,917 86,567 49,753 49,543 49,114 103,916 58,822 49,385
Diluted (in shares) 106,607 104,918 102,160 101,917 86,567 50,131 49,543 49,114 103,916 58,822 49,385