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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 30, 2016 |  | 30,742,662 |  |  |
Balance at Sep. 30, 2016 | $ 162,611 | $ 29 | $ 220,192 | $ (8,571) | $ (49,039)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares) |  | 760,687 |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units | 93 |  | 93 |  |
Compensation expense and incremental tax benefit from grants of common stock options and restricted stock | 6,979 |  | 6,979 |  |
Net loss | (39,187) |  |  |  | (39,187)
Defined benefit pension plan—unrecognized amounts, net of taxes | 1,589 |  |  | 1,589 |
Foreign currency translation | 551 |  |  | 551 |
Balance (in shares) at Sep. 30, 2017 |  | 31,503,349 |  |  |
Balance at Sep. 30, 2017 | 132,636 | $ 29 | 227,264 | (6,431) | (88,226)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares) |  | 973,755 |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units | 404 | $ 1 | 403 |  |
Compensation expense and incremental tax benefit from grants of common stock options and restricted stock | 6,346 |  | 6,346 |  |
Net loss | (11,615) |  |  |  | (11,615)
Defined benefit pension plan—unrecognized amounts, net of taxes | 773 |  |  | 773 |
Foreign currency translation | (791) |  |  |  |
Foreign currency translation and other | (788) |  |  | (791) | 3
Issuance of common stock for acquisition activity (in shares) |  | 297,014 |  |  |
Issuance of common stock for acquisition activity | 2,005 | $ 3 | 2,002 |  |
Balance (in shares) at Sep. 30, 2018 |  | 32,774,118 |  |  |
Balance at Sep. 30, 2018 | 129,654 | $ 33 | 236,115 | (6,449) | (100,045)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares) |  | 953,066 |  |  |
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units | 590 | $ 1 | 589 |  |
Net loss | (19,260) |  |  |  | (19,260)
Defined benefit pension plan—unrecognized amounts, net of taxes | (540) |  |  | (540) |
Foreign currency translation | (984) |  |  |  |
Foreign currency translation and other | (981) |  |  | (984) | 3
Tax settlements associated with stock compensation expense (in shares) |  | (6,906) |  |  |
Tax settlements associated with stock compensation expense | (44) |  | (44) |  |
Forfeiture of restricted stock awards (in shares) |  | (33,163) |  |  |
Forfeiture of restricted stock awards | 0 |  |  |  |
Stock compensation expense | 6,026 |  | 6,026 |  |
Balance (in shares) at Sep. 30, 2019 |  | 33,687,115 |  |  |
Balance at Sep. 30, 2019 | $ 116,175 | $ 34 | $ 242,686 | $ (7,973) | $ (118,572)

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