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Condensed Consolidated Statements of Stockholders Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit​
Balance (in shares) at Dec. 31, 2019   147,625,696      
Beginning balance at Dec. 31, 2019 $ 1,957,639 $ 1,477 $ 3,178,552 $ (100) $ (1,222,290)
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options (in shares)   160,286      
Exercise of common stock options 4,300 $ 2 4,298    
Issuance of common stock to fund the Company's 401(k) match (in shares)   136,559      
Issuance of common stock to fund the Company's 401(k) match 12,007 $ 1 12,006    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   1,141,376      
Compensation expense related to issuance of stock options and restricted stock awards 29,560 $ 11 29,549    
Issuance of common stock for business combinations and asset acquisition (in shares)   382,947      
Issuance of common stock for business combination and asset acquisition 28,597 $ 4 28,593    
Net loss (134,643)       (134,643)
Other comprehensive income (loss) (1,617)     (1,617)  
Ending balance at Mar. 31, 2020 1,895,843 $ 1,495 3,252,998 (1,717) (1,356,933)
Balance (in shares) at Mar. 31, 2020   149,446,864      
Balance (in shares) at Dec. 31, 2019   147,625,696      
Beginning balance at Dec. 31, 2019 $ 1,957,639 $ 1,477 3,178,552 (100) (1,222,290)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock for business combinations and asset acquisition (in shares) 382,947        
Issuance of common stock for business combination and asset acquisition $ 28,847        
Net loss (405,273)        
Ending balance at Sep. 30, 2020 1,730,686 $ 1,505 3,355,660 1,084 (1,627,563)
Balance (in shares) at Sep. 30, 2020   150,373,486      
Balance (in shares) at Mar. 31, 2020   149,446,864      
Beginning balance at Mar. 31, 2020 1,895,843 $ 1,495 3,252,998 (1,717) (1,356,933)
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options (in shares)   208,434      
Exercise of common stock options 6,638 $ 2 6,636    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   157,579      
Compensation expense related to issuance of stock options and restricted stock awards 40,039 $ 2 40,037    
Purchase of employee stock purchase plan shares (in shares)   167,921      
Purchase of employee stock purchase plan shares 9,799 $ 2 9,797    
Net loss (68,092)       (68,092)
Other comprehensive income (loss) 3,206     3,206  
Ending balance at Jun. 30, 2020 1,887,433 $ 1,501 3,309,468 1,489 (1,425,025)
Balance (in shares) at Jun. 30, 2020   149,980,798      
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options (in shares)   140,145      
Exercise of common stock options 4,470 $ 1 4,469    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   249,197      
Compensation expense related to issuance of stock options and restricted stock awards 41,476 $ 2 41,474    
Issuance of common stock for business combinations and asset acquisition (in shares)   3,346      
Issuance of common stock for business combination and asset acquisition 250 $ 1 249    
Net loss (202,538)       (202,538)
Other comprehensive income (loss) (405)     (405)  
Ending balance at Sep. 30, 2020 $ 1,730,686 $ 1,505 3,355,660 1,084 (1,627,563)
Balance (in shares) at Sep. 30, 2020   150,373,486      
Balance (in shares) at Dec. 31, 2020 159,423,410 159,423,410      
Beginning balance at Dec. 31, 2020 $ 2,235,552 $ 1,595 4,279,327 526 (2,045,896)
Increase (Decrease) in Stockholders' Equity          
Conversion of convertible notes, net of tax (in shares) 344        
Conversion of convertible notes, net of tax $ 26   26    
Exercise of common stock options (in shares)   967,107      
Exercise of common stock options 8,759 $ 10 8,749    
Issuance of common stock to fund the Company's 401(k) match (in shares)   162,606      
Issuance of common stock to fund the Company's 401(k) match 22,934 $ 2 22,932    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   1,355,435      
Compensation expense related to issuance of stock options and restricted stock awards 158,252 $ 13 158,239    
Issuance of common stock for business combinations and asset acquisition (in shares)   9,384,410      
Issuance of common stock for business combination and asset acquisition 1,254,798 $ 94 1,254,704    
Net loss (31,164)       (31,164)
Other comprehensive income (loss) (162)     (162)  
Ending balance at Mar. 31, 2021 $ 3,648,995 $ 1,714 5,723,977 364 (2,077,060)
Balance (in shares) at Mar. 31, 2021   171,293,312      
Balance (in shares) at Dec. 31, 2020 159,423,410 159,423,410      
Beginning balance at Dec. 31, 2020 $ 2,235,552 $ 1,595 4,279,327 526 (2,045,896)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock for business combinations and asset acquisition (in shares) 9,510,436        
Issuance of common stock for business combination and asset acquisition $ 1,270,918        
Net loss (375,014)        
Ending balance at Sep. 30, 2021 $ 3,457,590 $ 1,723 5,876,644 133 (2,420,910)
Balance (in shares) at Sep. 30, 2021 172,242,798 172,242,798      
Balance (in shares) at Mar. 31, 2021   171,293,312      
Beginning balance at Mar. 31, 2021 $ 3,648,995 $ 1,714 5,723,977 364 (2,077,060)
Increase (Decrease) in Stockholders' Equity          
Conversion of convertible notes, net of tax (in shares) 197        
Conversion of convertible notes, net of tax $ 14   14    
Exercise of common stock options (in shares)   140,478      
Exercise of common stock options 2,858 $ 1 2,857    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   121,575      
Compensation expense related to issuance of stock options and restricted stock awards 56,285 $ 2 56,283    
Issuance of common stock for business combinations and asset acquisition (in shares)   126,026      
Issuance of common stock for business combination and asset acquisition 16,120 $ 1 16,119    
Purchase of employee stock purchase plan shares (in shares)   173,717      
Purchase of employee stock purchase plan shares 12,038 $ 2 12,036    
Net loss (176,912)       (176,912)
Other comprehensive income (loss) (297)     (297)  
Ending balance at Jun. 30, 2021 $ 3,559,101 $ 1,720 5,811,286 67 (2,253,972)
Balance (in shares) at Jun. 30, 2021   171,855,305      
Increase (Decrease) in Stockholders' Equity          
Conversion of convertible notes, net of tax (in shares) 39        
Conversion of convertible notes, net of tax $ 3   3    
Exercise of common stock options (in shares)   100,474      
Exercise of common stock options 1,755 $ 1 1,754    
Compensation expense related to issuance of stock options and restricted stock awards (in shares)   286,980      
Compensation expense related to issuance of stock options and restricted stock awards 63,603 $ 2 63,601    
Net loss (166,938)       (166,938)
Other comprehensive income (loss) 66     66  
Ending balance at Sep. 30, 2021 $ 3,457,590 $ 1,723 $ 5,876,644 $ 133 $ (2,420,910)
Balance (in shares) at Sep. 30, 2021 172,242,798 172,242,798