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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common stock | Additional Paid-In Capital Adjustment. | Additional Paid-In Capital | Treasury Stock | Accumulated Deficit Adjustment. | Accumulated Deficit | Adjustment. | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 34 |  | $ 447,297 |  |  | $ (359,899) |  | $ 87,432
Balance at beginning of period, shares at Dec. 31, 2019 | 33,678,840 |  |  |  |  |  |  |
Exercise of common stock options | $ 1 |  | 6,656 |  |  |  |  | 6,657
Exercise of common stock options, shares | 637,924 |  |  |  |  |  |  |
Issuance for employee stock purchase plan |  |  | 758 |  |  |  |  | 758
Issuance for employee stock purchase plan, shares | 67,512 |  |  |  |  |  |  |
Vesting of RSUs and PSUs, shares | 335,524 |  |  |  |  |  |  |
Shares withheld for employee taxes upon vesting of RSUs and PSUs |  |  | (2,255) |  |  |  |  | (2,255)
Shares withheld for employee taxes upon vesting of RSUs and PSUs, shares | (107,746) |  |  |  |  |  |  |
Stock-based compensation |  |  | 21,910 |  |  |  |  | 21,910
Equity component of 2020 Convertible Notes, net of issuance costs |  |  | 44,777 |  |  |  |  | 44,777
Net (loss) income |  |  |  |  |  | 26,752 |  | 26,752
Balance at end of period at Dec. 31, 2020 | $ 35 | $ (44,777) | 519,143 |  | $ 5,288 | (333,147) | $ (39,489) | 186,031
Balance at end of period, shares at Dec. 31, 2020 | 34,612,054 |  |  |  |  |  |  |
Exercise of common stock options | $ 1 |  | 11,868 |  |  |  |  | 11,869
Exercise of common stock options, shares | 803,485 |  |  |  |  |  |  |
Issuance for employee stock purchase plan |  |  | 755 |  |  |  |  | 755
Issuance for employee stock purchase plan, shares | 43,719 |  |  |  |  |  |  |
Vesting of RSUs and PSUs, shares | 511,743 |  |  |  |  |  |  |
Shares withheld for employee taxes upon vesting of RSUs and PSUs |  |  | (4,149) |  |  |  |  | (4,149)
Shares withheld for employee taxes upon vesting of RSUs and PSUs, shares | (164,882) |  |  |  |  |  |  |
Share repurchases |  |  |  | $ (42,861) |  |  |  | (42,861)
Share repurchases (in shares) |  |  |  | (2,150,717) |  |  |  |
Forward contract on ASR agreement |  |  | (5,000) |  |  |  |  | (5,000)
Stock-based compensation |  |  | 24,255 |  |  |  |  | 24,255
Net (loss) income |  |  |  |  |  | 71,517 |  | 71,517
Balance at end of period at Dec. 31, 2021 | $ 36 |  | 502,095 | $ (42,861) |  | (256,342) |  | $ 202,928
Balance at end of period, shares at Dec. 31, 2021 | 35,806,119 |  |  |  |  |  |  | 35,806,119
Balance at end of period, shares at Dec. 31, 2021 |  |  |  | (2,150,717) |  |  |  | (2,150,717)
Exercise of common stock options |  |  | 11,811 |  |  |  |  | $ 11,811
Exercise of common stock options, shares | 742,348 |  |  |  |  |  |  |
Issuance for employee stock purchase plan |  |  | 337 |  |  |  |  | 337
Issuance for employee stock purchase plan, shares | 22,627 |  |  |  |  |  |  |
Vesting of RSUs and PSUs | $ 1 |  |  |  |  |  |  | 1
Vesting of RSUs and PSUs, shares | 699,285 |  |  |  |  |  |  |
Shares withheld for employee taxes upon vesting of RSUs and PSUs |  |  | (4,044) |  |  |  |  | (4,044)
Shares withheld for employee taxes upon vesting of RSUs and PSUs, shares | (226,286) |  |  |  |  |  |  |
Share repurchases |  |  | 5,000 | $ (19,063) |  |  |  | (14,063)
Share repurchases (in shares) |  |  |  | (1,085,106) |  |  |  |
Exercise of warrant | 40,666 |  |  |  |  |  |  |
Stock-based compensation |  |  | 22,874 |  |  |  |  | 22,874
Net (loss) income |  |  |  |  |  | (25,002) |  | (25,002)
Balance at end of period at Dec. 31, 2022 | $ 37 |  | $ 538,073 | $ (61,924) |  | $ (281,344) |  | $ 194,842
Balance at end of period, shares at Dec. 31, 2022 | 37,084,759 |  |  |  |  |  |  | 37,084,759
Balance at end of period, shares at Dec. 31, 2022 |  |  |  | (3,235,823) |  |  |  | (3,235,823)

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