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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 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 Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
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) |  |  | 364,000 |  |  |  |  |
Exercise of options to purchase common stock | 15.4 |  |  | 15.4 |  |  |  |
Issuance of shares for employee stock purchase plan (in shares) |  |  | 36,000 |  |  |  |  |
Issuance of shares for employee stock purchase plan | 8.1 |  |  | 8.1 |  |  |  |
Stock-based compensation expense | 34.4 |  |  | 34.4 |  |  |  |
Restricted stock units vested, net of shares withheld for taxes (in shares) |  |  | 176,000 |  |  |  |  |
Restricted stock units vested, net of shares withheld for taxes | (28.2) |  |  | (28.2) |  |  |  |
Extinguishment of conversion feature, net of issuance costs | (808.5) |  |  | (808.5) |  |  |  |
Issuance of shares for debt extinguishment (in shares) |  |  | 2,586,000 |  |  |  |  |
Issuance of shares for debt extinguishment | 722.4 |  |  | 722.4 |  |  |  |
Net income | 16.8 |  |  |  |  | 16.8 |  |
Other comprehensive income (loss) | (7.7) |  |  |  |  |  |  | (7.7)
Ending balance (in shares) at Dec. 31, 2021 |  |  | 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2020-06 |  |  |  |  |  |  |
Exercise of options to purchase common stock (in shares) |  |  | 147,000 |  |  |  |  |
Exercise of options to purchase common stock | $ 6.9 |  |  | 6.9 |  |  |  |
Issuance of shares for employee stock purchase plan (in shares) |  |  | 53,000 |  |  |  |  |
Issuance of shares for employee stock purchase plan | 9.4 |  |  | 9.4 |  |  |  |
Stock-based compensation expense | 40.9 |  |  | 40.9 |  |  |  |
Restricted stock units vested, net of shares withheld for taxes (in shares) |  |  | 132,000 |  |  |  |  |
Restricted stock units vested, net of shares withheld for taxes | (16.8) |  |  | (16.8) |  |  |  |
Net income | 4.6 |  |  |  |  | 4.6 |  |
Other comprehensive income (loss) | $ 22.2 |  |  |  |  |  |  | 22.2
Ending balance (in shares) at Dec. 31, 2022 | 69,511,286 |  | 69,511,000 |  |  |  |  |
Ending balance 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) | 250,192 |  | 249,000 |  |  |  |  |
Exercise of options to purchase common stock | $ 16.3 |  |  | 16.3 |  |  |  |
Issuance of shares for employee stock purchase plan (in shares) |  |  | 55,000 |  |  |  |  |
Issuance of shares for employee stock purchase plan | 10.6 |  |  | 10.6 |  |  |  |
Stock-based compensation expense | 48.3 |  |  | 48.3 |  |  |  |
Restricted stock units vested, net of shares withheld for taxes (in shares) |  |  | 92,000 |  |  |  |  |
Restricted stock units vested, net of shares withheld for taxes | (13.2) |  |  | (13.2) |  |  |  |
Net income | 206.3 |  |  |  |  | 206.3 |  |
Other comprehensive income (loss) | $ (12.0) |  |  |  |  |  |  | (12.0)
Ending balance (in shares) at Dec. 31, 2023 | 69,907,289 |  | 69,907,000 |  |  |  |  |
Ending balance at Dec. 31, 2023 | $ 732.7 |  | $ 0.1 | $ 1,102.6 |  | $ (378.0) |  | $ 8.0

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