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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | [1] | Convertible Senior Notes Due 2022 | Common Stock | Common Stock Convertible Senior Notes Due 2022 | Additional Paid-In Capital | Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment | [1] | Additional Paid-In Capital Convertible Senior Notes Due 2022 | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | [1] | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2021 |  |  |  | 44,734,000 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2021 | $ 730,408 | $ (49,233) |  | $ 45 |  | $ 942,091 | $ (96,468) |  | $ (211,895) | $ 47,235 | $ 167
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 630,000 |  |  |  |  |  |  |
Exercise of stock options | 21,935 |  |  | $ 1 |  | 21,934 |  |  |  |  |
Vested restricted stock units (in shares) |  |  |  | 299,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  |  | 37,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan | 1,821 |  |  |  |  | 1,821 |  |  |  |  |
Stock-based compensation | 22,733 |  |  |  |  | 22,733 |  |  |  |  |
Issuance of common stock upon conversion of 2022 convertible senior notes (in shares) |  |  |  |  | 102,000 |  |  |  |  |  |
Issuance of common stock upon conversion of 2022 convertible senior notes |  |  | $ 3,040 |  |  |  |  | $ 3,040 |  |  |
Other comprehensive income (loss) | (772) |  |  |  |  |  |  |  |  |  | (772)
Net income | 26,704 |  |  |  |  |  |  |  | 26,704 |  |
Ending balance (in shares) at Jun. 30, 2022 |  |  |  | 45,802,000 |  |  |  |  |  |  |
Balance at ending of period at Jun. 30, 2022 | 756,636 |  |  | $ 46 |  | 895,151 |  |  | (137,956) |  | (605)
Beginning balance (in shares) at Mar. 31, 2022 |  |  |  | 45,064,000 |  |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2022 | 709,576 |  |  | $ 45 |  | 867,890 |  |  | (157,832) |  | (527)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 307,000 |  |  |  |  |  |  |
Exercise of stock options | 10,857 |  |  | $ 1 |  | 10,856 |  |  |  |  |
Vested restricted stock units (in shares) |  |  |  | 292,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  |  | 37,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan | 1,821 |  |  |  |  | 1,821 |  |  |  |  |
Stock-based compensation | 11,544 |  |  |  |  | 11,544 |  |  |  |  |
Issuance of common stock upon conversion of 2022 convertible senior notes (in shares) |  |  |  |  | 102,000 |  |  |  |  |  |
Issuance of common stock upon conversion of 2022 convertible senior notes |  |  | $ 3,040 |  |  |  |  | $ 3,040 |  |  |
Other comprehensive income (loss) | (78) |  |  |  |  |  |  |  |  |  | (78)
Net income | 19,876 |  |  |  |  |  |  |  | 19,876 |  |
Ending balance (in shares) at Jun. 30, 2022 |  |  |  | 45,802,000 |  |  |  |  |  |  |
Balance at ending of period at Jun. 30, 2022 | 756,636 |  |  | $ 46 |  | 895,151 |  |  | (137,956) |  | (605)
Beginning balance (in shares) at Dec. 31, 2022 |  |  |  | 45,928,000 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2022 | $ 775,010 |  |  | $ 46 |  | 924,095 |  |  | (148,751) |  | (380)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) | 61,896 |  |  | 62,000 |  |  |  |  |  |  |
Exercise of stock options | $ 1,914 |  |  |  |  | 1,914 |  |  |  |  |
Vested restricted stock units (in shares) |  |  |  | 369,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) | 50,634 |  |  | 50,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan | $ 1,672 |  |  |  |  | 1,672 |  |  |  |  |
Stock-based compensation | 22,945 |  |  |  |  | 22,945 |  |  |  |  |
Other comprehensive income (loss) | 207 |  |  |  |  |  |  |  |  |  | 207
Net income | 6,227 |  |  |  |  |  |  |  | 6,227 |  |
Ending balance (in shares) at Jun. 30, 2023 |  |  |  | 46,409,000 |  |  |  |  |  |  |
Balance at ending of period at Jun. 30, 2023 | 807,975 |  |  | $ 46 |  | 950,626 |  |  | (142,524) |  | (173)
Beginning balance (in shares) at Mar. 31, 2023 |  |  |  | 45,970,000 |  |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2023 | 768,041 |  |  | $ 46 |  | 936,419 |  |  | (168,287) |  | (137)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |
Exercise of stock options | 1,580 |  |  |  |  | 1,580 |  |  |  |  |
Vested restricted stock units (in shares) |  |  |  | 339,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan | 1,672 |  |  |  |  | 1,672 |  |  |  |  |
Stock-based compensation | 10,955 |  |  |  |  | 10,955 |  |  |  |  |
Other comprehensive income (loss) | (36) |  |  |  |  |  |  |  |  |  | (36)
Net income | 25,763 |  |  |  |  |  |  |  | 25,763 |  |
Ending balance (in shares) at Jun. 30, 2023 |  |  |  | 46,409,000 |  |  |  |  |  |  |
Balance at ending of period at Jun. 30, 2023 | $ 807,975 |  |  | $ 46 |  | $ 950,626 |  |  | $ (142,524) |  | $ (173)
[1] | Effective January 1, 2022, the Company adopted 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) on a modified retrospective method of transition. As a result, the Company no longer separately presents in equity an embedded conversion feature for its convertible debt.

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