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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenue $ 891,925,000 $ 1,194,651,000 $ 1,148,337,000
Cost of revenue 577,411,000 781,862,000 786,903,000
Gross profit 314,514,000 412,789,000 361,434,000
Operating expenses:      
Research and development 131,589,000 142,894,000 167,296,000
Sales and marketing 151,380,000 206,431,000 222,096,000
General and administrative 68,364,000 65,797,000 66,004,000
Total operating expenses 351,333,000 415,122,000 455,396,000
Operating loss (36,819,000) (2,333,000) (93,962,000)
Interest expense (20,257,000) (19,229,000) (18,683,000)
Other income (expense), net (4,881,000) (2,492,000) (4,970,000)
Total other expense, net (25,138,000) (16,737,000) (13,713,000)
Loss before income taxes (61,957,000) (19,070,000) (107,675,000)
Income tax expense (benefit) (4,826,000) 4,428,000 (1,359,000)
Net loss $ (66,783,000) $ (14,642,000) $ (109,034,000)
Weighted Average Number of Shares Outstanding, Basic and Diluted 149,037 144,891 139,495