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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 161,109 $ 137,653 $ 145,421 $ 118,928 $ 166,896 $ 152,468 $ 137,361 $ 121,180      
Cost of revenue 60,164 58,776 64,748 62,339 71,182 70,234 62,250 65,907      
Gross profit 100,945 78,877 80,673 56,589 95,714 82,234 75,111 55,273 $ 317,084 $ 308,332 $ 201,496
(Loss) income from operations (148,822) 2,686 (7,096) (36,228) 1,177 (7,566) (16,636) (42,383) (189,460) (65,408) (55,229)
Net loss $ (150,363) $ 1,650 $ 49,470 $ (30,832) $ (1,826) $ (10,158) $ (19,922) $ (44,904) $ (130,075) $ (76,810) $ (35,252)
Loss per share:                      
Basic (in dollars per share) $ (1.36) $ 0.01 $ 0.45 $ (0.29) $ (0.02) $ (0.10) $ (0.20) $ (0.44) $ (1.19) $ (0.74) $ (0.60)
Diluted (in dollars per share) $ (1.36) $ 0.01 $ 0.45 $ (0.29) $ (0.02) $ (0.10) $ (0.20) $ (0.44) $ (1.19) $ (0.74) $ (0.60)
Shares used in computing loss per share:                      
Basic (in shares) 110,269 110,080 110,394 108,167 106,607 104,918 102,160 101,917 109,734 103,916 58,822
Diluted (in shares) 110,269 110,756 110,698 108,167 106,607 104,918 102,160 101,917 109,734 103,916 58,822