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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2020     66,017,000          
Beginning balance at Dec. 31, 2020 $ 603.6   $ 0.1 $ 1,264.3   $ (666.3)   $ 5.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)       259,000        
Exercise of options to purchase common stock       $ 10.5        
Issuance of shares for employee stock purchase plan (in shares)     17,000          
Issuance of shares for employee stock purchase plan 3.9     3.9        
Stock-based compensation expense 25.8     25.8        
Restricted stock units vested, net of shares withheld for taxes (in shares)     172,000          
Restricted stock units vested, net of shares withheld for taxes (27.6)     (27.6)        
Extinguishment of conversion feature, net of issuance costs (779.4)     (779.4)        
Issuance of shares for debt extinguishment (in shares)     2,457,000          
Issuance of shares for debt extinguishment 682.4     682.4        
Net income (loss) (12.4)         (12.4)    
Other comprehensive income (loss) (8.9)             (8.9)
Ending balance (in shares) at Sep. 30, 2021     68,922,000          
Ending balance at Sep. 30, 2021 497.9   $ 0.1 1,179.9   (678.7)   (3.4)
Beginning balance (in shares) at Dec. 31, 2020     66,017,000          
Beginning balance at Dec. 31, 2020 $ 603.6   $ 0.1 1,264.3   (666.3)   5.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2020-06              
Ending balance (in shares) at Dec. 31, 2021 69,178,691   69,179,000          
Ending balance at Dec. 31, 2021 $ 556.3 $ (147.1) $ 0.1 1,207.9 $ (207.7) (649.5) $ 60.6 (2.2)
Beginning balance (in shares) at Jun. 30, 2021     68,610,000          
Beginning balance at Jun. 30, 2021 459.1   $ 0.1 1,149.6   (691.3)   0.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)     95,000          
Exercise of options to purchase common stock 4.3     4.3        
Stock-based compensation expense 8.2     8.2        
Restricted stock units vested, net of shares withheld for taxes (in shares)     2,000          
Restricted stock units vested, net of shares withheld for taxes (0.2)     (0.2)        
Extinguishment of conversion feature, net of issuance costs (41.7)     (41.7)        
Issuance of shares for debt extinguishment (in shares)     215,000          
Issuance of shares for debt extinguishment 59.7     59.7        
Net income (loss) 12.6         12.6    
Other comprehensive income (loss) (4.1)             (4.1)
Ending balance (in shares) at Sep. 30, 2021     68,922,000          
Ending balance at Sep. 30, 2021 $ 497.9   $ 0.1 1,179.9   (678.7)   (3.4)
Beginning balance (in shares) at Dec. 31, 2021 69,178,691   69,179,000          
Beginning balance at Dec. 31, 2021 $ 556.3 $ (147.1) $ 0.1 1,207.9 $ (207.7) (649.5) $ 60.6 (2.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)     95,000          
Exercise of options to purchase common stock 4.3     4.3        
Issuance of shares for employee stock purchase plan (in shares)     27,000          
Issuance of shares for employee stock purchase plan 4.9     4.9        
Stock-based compensation expense 29.7     29.7        
Restricted stock units vested, net of shares withheld for taxes (in shares)     130,000          
Restricted stock units vested, net of shares withheld for taxes (16.7)     (16.7)        
Net income (loss) (12.4)         (12.4)    
Other comprehensive income (loss) $ 9.0             9.0
Ending balance (in shares) at Sep. 30, 2022 69,431,159   69,431,000          
Ending balance at Sep. 30, 2022 $ 428.0   $ 0.1 1,022.4   (601.3)   6.8
Beginning balance (in shares) at Jun. 30, 2022     69,386,000          
Beginning balance at Jun. 30, 2022 422.4   $ 0.1 1,011.2   (596.1)   7.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)     43,000          
Exercise of options to purchase common stock 2.4     2.4        
Stock-based compensation expense 9.0     9.0        
Restricted stock units vested, net of shares withheld for taxes (in shares)     2,000          
Restricted stock units vested, net of shares withheld for taxes (0.2)     (0.2)        
Net income (loss) (5.2)         (5.2)    
Other comprehensive income (loss) $ (0.4)             (0.4)
Ending balance (in shares) at Sep. 30, 2022 69,431,159   69,431,000          
Ending balance at Sep. 30, 2022 $ 428.0   $ 0.1 $ 1,022.4   $ (601.3)   $ 6.8