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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2021     69,179,000          
Balance at beginning of period 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     69,431,000          
Balance at the end of period 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          
Balance at beginning of period 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     69,431,000          
Balance at the end of period at Sep. 30, 2022 $ 428.0   $ 0.1 1,022.4   (601.3)   6.8
Beginning balance (in shares) at Dec. 31, 2022 69,511,286   69,511,000          
Balance at beginning of period at Dec. 31, 2022 $ 476.4   $ 0.1 1,040.6   (584.3)   20.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)     202,000          
Exercise of options to purchase common stock 12.4     12.4        
Issuance of shares for employee stock purchase plan (in shares)     23,000          
Issuance of shares for employee stock purchase plan 5.5     5.5        
Stock-based compensation expense 35.7     35.7        
Restricted stock units vested, net of shares withheld for taxes (in shares)     90,000          
Restricted stock units vested, net of shares withheld for taxes (13.1)     (13.1)        
Net income (loss) 103.0         103.0    
Other comprehensive income (loss) $ (12.4)             (12.4)
Ending balance (in shares) at Sep. 30, 2023 69,825,875   69,826,000          
Balance at the end of period at Sep. 30, 2023 $ 607.5   $ 0.1 1,081.1   (481.3)   7.6
Beginning balance (in shares) at Jun. 30, 2023     69,804,000          
Balance at beginning of period at Jun. 30, 2023 553.9   $ 0.1 1,070.7   (533.2)   16.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of options to purchase common stock (in shares)     19,000          
Exercise of options to purchase common stock 0.1     0.1        
Stock-based compensation expense 10.5     10.5        
Restricted stock units vested, net of shares withheld for taxes (in shares)     3,000          
Restricted stock units vested, net of shares withheld for taxes (0.2)     (0.2)        
Net income (loss) 51.9         51.9    
Other comprehensive income (loss) $ (8.7)             (8.7)
Ending balance (in shares) at Sep. 30, 2023 69,825,875   69,826,000          
Balance at the end of period at Sep. 30, 2023 $ 607.5   $ 0.1 $ 1,081.1   $ (481.3)   $ 7.6
[1] The Company recorded a cumulative effect adjustment to additional paid-in capital and retained earnings to reflect the adoption of Accounting Standards Update 2020-06, Debt – Debt With Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. Refer to Note 2 of Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2022.