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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Class A and Class B Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive (Loss) Income
Balance at Dec. 31, 2015 $ 242,545 $ 84 $ 378,162 $ (135,565) $ (136)
Balance (in shares) at Dec. 31, 2015   84,311      
Increase (Decrease) in Stockholders' Equity          
Net loss (194,375)     (194,375)  
Other comprehensive income 149       149
Exercise of options to purchase common stock 209 $ 1 208    
Exercise of options to purchase common stock (in shares)   70      
Issuance of common stock upon vesting of RSUs 2 $ 2      
Issuance of common stock upon vesting of RSUs (in shares)   1,963      
Shares withheld related to net settlement of RSUs (21,092) $ (1) (21,091)    
Shares withheld related to net settlement of RSUs (in shares)   (525)      
Equity compensation expense 51,494   51,494    
Acquisition of a business 452   452    
Acquisition of a business (in shares)   12      
Balance at Dec. 31, 2016 79,384 $ 86 409,225 (329,940) 13
Balance (in shares) at Dec. 31, 2016   85,831      
Increase (Decrease) in Stockholders' Equity          
Net loss (244,614)     (244,614)  
Other comprehensive income (2,376)       (2,376)
Exercise of options to purchase common stock 244 $ 0 244    
Exercise of options to purchase common stock (in shares)   84      
Issuance of common stock upon vesting of RSUs 2 $ 2      
Issuance of common stock upon vesting of RSUs (in shares)   2,327      
Shares withheld related to net settlement of RSUs (1,562) $ 0 (1,562)    
Shares withheld related to net settlement of RSUs (in shares)   (33)      
Equity compensation expense 71,380   71,380    
Equity component of issuance of convertible notes, net (Note 14) 49,213   49,213    
Balance at Dec. 31, 2017 (48,329) $ 88 537,212 (583,266) (2,363)
Balance (in shares) at Dec. 31, 2017   88,209      
Increase (Decrease) in Stockholders' Equity          
Adoption of ASU     8,712    
Adoption of ASU | ASU 2016-09 0     (8,712)  
Net loss (504,080)     (504,080)  
Other comprehensive income 583       583
Exercise of options to purchase common stock 138   138    
Exercise of options to purchase common stock (in shares)   46      
Issuance of common stock upon vesting of RSUs 3 $ 3      
Issuance of common stock upon vesting of RSUs (in shares)   2,504      
Shares withheld related to net settlement of RSUs (1,284)   (1,284)    
Shares withheld related to net settlement of RSUs (in shares)   11      
Equity compensation expense 133,638   133,638    
Equity component of issuance of convertible notes, net (Note 14) 83,953   83,953    
Balance at Dec. 31, 2018 (330,721) $ 91 $ 753,657 (1,082,689) $ (1,780)
Balance (in shares) at Dec. 31, 2018   90,748      
Increase (Decrease) in Stockholders' Equity          
Adoption of ASU | ASU 2014-09 $ 4,657     $ 4,657