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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2017 |  | 33,516 |  |
Beginning balance at Sep. 30, 2017 | $ 682,440 | $ 34 | $ 873,063 | $ (190,657)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net (loss) income and comprehensive (loss) income | (45,375) |  |  | (45,375)
Stock-based compensation expense | 10,258 |  | 10,258 |
Exercises of stock options (in shares) |  | 8 |  |
Exercises of stock options | 64 |  | 64 |
Shares issued under employee stock plans, net (in shares) |  | 443 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (216) |  |
Common stock redeemed for tax liability (in shares) |  | (229) |  |
Common stock redeemed for tax liability | (3,378) |  | (3,378) |
Other activity | 18 |  | 18 |
Ending balance (in shares) at Sep. 30, 2018 |  | 33,522 |  |
Ending balance at Sep. 30, 2018 | 644,027 | $ 34 | 880,025 | (236,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net (loss) income and comprehensive (loss) income | (79,520) |  |  | (79,520)
Stock-based compensation expense | 10,526 |  | 10,526 |
Exercises of stock options (in shares) |  | 32 |  |
Exercises of stock options | 314 |  | 314 |
Shares issued under employee stock plans, net (in shares) |  | 917 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (68) |  |
Common stock redeemed for tax liability (in shares) |  | (185) |  |
Common stock redeemed for tax liability | (1,969) |  | (1,969) |
Share repurchases (in shares) |  | (3,285) |  |
Share repurchases | (34,624) | $ (3) | (34,621) |
Ending balance (in shares) at Sep. 30, 2019 |  | 30,933 |  |
Ending balance at Sep. 30, 2019 | 538,754 | $ 31 | 854,275 | (315,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net (loss) income and comprehensive (loss) income | 52,226 |  |  | 52,226
Stock-based compensation expense | 10,036 |  | 10,036 |
Exercises of stock options (in shares) |  | 52 |  |
Exercises of stock options | 226 |  | 226 |
Shares issued under employee stock plans, net (in shares) |  | 588 |  |
Forfeiture and other settlements of restricted stock (in shares) |  | (26) |  |
Forfeiture and other settlements of restricted stock | (2,058) |  | (2,058) |
Common stock redeemed for tax liability (in shares) |  | (173) |  |
Common stock redeemed for tax liability | $ (2,686) |  | (2,686) |
Share repurchases (in shares) | (362) | (362) |  |
Share repurchases | $ (3,327) |  | (3,327) |
Ending balance (in shares) at Sep. 30, 2020 |  | 31,012 |  |
Ending balance at Sep. 30, 2020 | $ 593,171 | $ 31 | $ 856,466 | $ (263,326)

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