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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2020 |  | 31,012 |  |
Beginning balance at Sep. 30, 2020 | $ 593,171 | $ 31 | $ 856,466 | $ (263,326)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 11,997 |  |  | 11,997
Net comprehensive income | 11,997 |  |  | 11,997
Stock-based compensation expense | 3,511 |  | 3,511 |
Exercises of stock options (in shares) |  | 117 |  |
Stock option exercises | 3 |  | 3 |
Shares issued under employee stock plans, net (in shares) |  | 411 |  |
Common stock redeemed for tax liability (in shares) |  | (286) |  |
Common stock redeemed for tax liability | (2,620) |  | (2,620) |
Ending balance (in shares) at Dec. 31, 2020 |  | 31,254 |  |
Ending balance at Dec. 31, 2020 | 606,062 | $ 31 | 857,360 | (251,329)
Beginning balance (in shares) at Sep. 30, 2021 |  | 31,294 |  |
Beginning balance at Sep. 30, 2021 | 724,884 | $ 31 | 866,158 | (141,305)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 34,885 |  |  | 34,885
Net comprehensive income | 34,885 |  |  | 34,885
Stock-based compensation expense | 2,108 |  | 2,108 |
Shares issued under employee stock plans, net (in shares) |  | 517 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (44) |  |
Common stock redeemed for tax liability (in shares) |  | (307) |  |
Common stock redeemed for tax liability | (6,618) |  | (6,618) |
Ending balance (in shares) at Dec. 31, 2021 |  | 31,460 |  |
Ending balance at Dec. 31, 2021 | $ 755,259 | $ 31 | $ 861,648 | $ (106,420)

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