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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.

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