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Condensed 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 and comprehensive loss | (105,980) |  |  | (105,980)
Amortization of nonvested stock awards | 7,692 |  | 7,692 |
Exercises of stock options (in shares) |  | 8 |  |
Exercises of stock options | 62 |  | 62 |
Shares issued under employee stock plans, net (in shares) |  | 443 |  |
Forfeiture of restricted stock (in shares) |  | (210) |  |
Common stock redeemed (in shares) |  | (79) |  |
Common stock redeemed for tax liability | (1,565) |  | (1,565) |
Other activity | 18 |  | 18 |
Ending balance (in shares) at Jun. 30, 2018 |  | 33,678 |  |
Ending balance at Jun. 30, 2018 | 582,667 | $ 34 | 879,270 | (296,637)
Beginning balance (in shares) at Mar. 31, 2018 |  | 33,628 |  |
Beginning balance at Mar. 31, 2018 | 566,966 | $ 34 | 876,978 | (310,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss and comprehensive loss | 13,409 |  |  | 13,409
Amortization of nonvested stock awards | 2,484 |  | 2,484 |
Exercises of stock options (in shares) |  | 6 |  |
Exercises of stock options | 49 |  | 49 |
Shares issued under employee stock plans, net (in shares) |  | 66 |  |
Forfeiture of restricted stock (in shares) |  | (6) |  |
Common stock redeemed (in shares) |  | (16) |  |
Common stock redeemed for tax liability | (241) |  | (241) |
Ending balance (in shares) at Jun. 30, 2018 |  | 33,678 |  |
Ending balance at Jun. 30, 2018 | 582,667 | $ 34 | 879,270 | (296,637)
Beginning balance (in shares) at Sep. 30, 2018 |  | 33,522 |  |
Beginning balance at Sep. 30, 2018 | 644,027 | $ 34 | 880,025 | (236,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss and comprehensive loss | (81,949) |  |  | (81,949)
Amortization of nonvested stock awards | 7,993 |  | 7,993 |
Exercises of stock options (in shares) |  | 27 |  |
Exercises of stock options | 278 |  | 278 |
Shares issued under employee stock plans, net (in shares) |  | 914 |  |
Forfeiture of restricted stock (in shares) |  | (36) |  |
Common stock redeemed (in shares) |  | (179) |  |
Common stock redeemed for tax liability | (1,889) |  | (1,889) |
Share repurchases (in shares) |  | (3,200) |  |
Share repurchases | (34,624) | $ (3) | (34,621) |
Ending balance (in shares) at Jun. 30, 2019 |  | 31,048 |  |
Ending balance at Jun. 30, 2019 | 533,836 | $ 31 | 851,786 | (317,981)
Beginning balance (in shares) at Mar. 31, 2019 |  | 32,044 |  |
Beginning balance at Mar. 31, 2019 | 529,158 | $ 32 | 858,709 | (329,583)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss and comprehensive loss | 11,602 |  |  | 11,602
Amortization of nonvested stock awards | 3,699 |  | 3,699 |
Shares issued under employee stock plans, net (in shares) |  | 4 |  |
Forfeiture of restricted stock (in shares) |  | (6) |  |
Common stock redeemed (in shares) |  | 0 |  |
Common stock redeemed for tax liability | (3) |  | (3) |
Share repurchases (in shares) |  | (994) |  |
Share repurchases | (10,620) | $ (1) | (10,619) |
Ending balance (in shares) at Jun. 30, 2019 |  | 31,048 |  |
Ending balance at Jun. 30, 2019 | $ 533,836 | $ 31 | $ 851,786 | $ (317,981)

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