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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | 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 | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2020 | $ 364,761 |  | $ 158 | $ 1,188,673 |  | $ (640,909) |  | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2020 |  |  | 15,766,000 |  |  |  |  | 2,641,000
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income and comprehensive income | 19,049 |  |  |  |  | 19,049 |  |
Non-cash compensation | 16,436 |  |  | 16,436 |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (4,801) |  |  | (4,801) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  |  | 31,000 |  |  |  |  |
Other | (2) |  |  | (2) |  |  |  |
Ending balance at Mar. 31, 2021 | 395,443 |  | $ 158 | 1,200,306 |  | (621,860) |  | $ (183,161)
Ending balance (in shares) at Mar. 31, 2021 |  |  | 15,797,000 |  |  |  |  | 2,641,000
Beginning balance at Dec. 31, 2020 | 364,761 |  | $ 158 | 1,188,673 |  | (640,909) |  | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2020 |  |  | 15,766,000 |  |  |  |  | 2,641,000
Ending balance at Dec. 31, 2021 | $ 447,992 | $ (65,303) | $ 161 | 1,242,794 | $ (109,750) | (571,794) | $ 44,447 | $ (223,169)
Ending balance (in shares) at Dec. 31, 2021 |  |  | 16,071,000 |  |  |  |  | 2,976,000
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2020-06 [Member] |  |  |  |  |  |  |
Net income and comprehensive income | $ (10,826) |  |  |  |  | (10,826) |  |
Non-cash compensation | 15,080 |  |  | 15,080 |  |  |  |
Purchase of treasury stock | $ (43,009) |  |  |  |  |  |  | $ (43,009)
Purchase of treasury stock (in shares) | 379,895 |  |  |  |  |  |  | 379,000
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | $ (3,086) |  |  | (3,086) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  |  | 49,000 |  |  |  |  |
Ending balance at Mar. 31, 2022 | $ 340,848 |  | $ 161 | $ 1,145,038 |  | $ (538,173) |  | $ (266,178)
Ending balance (in shares) at Mar. 31, 2022 |  |  | 16,120,000 |  |  |  |  | 3,355,000

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