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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Treasury Stock | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2020 |  | 41,780,000 |  |  |  |
Beginning Balance at Sep. 30, 2020 | $ 132,243 | $ 42 | $ 146,518 |  | $ (13,994) | $ (323)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 260,000 |  |  |  |
Exercise of stock options | 1,958 |  | 1,958 |  |  |
Settlement of restricted stock units (in shares) |  | 935,000 |  |  |  |
Settlement of restricted stock units |  | $ 1 | (1) |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 77,000 |  |  |  |
Issuance of common stock under employee stock purchase plan | 792 |  | 792 |  |  |
Stock-based compensation expense | 5,715 |  | 5,715 |  |  |
Sale of convertible senior notes warrants | 23,909 |  | 23,909 |  |  |
Net income | 3,186 |  |  |  | 3,186 |
Components of comprehensive income (loss): |  |  |  |  |  |
Currency translation adjustment | 112 |  |  |  |  | 112
Change in unrealized gain (loss) on investments | (186) |  |  |  |  | (186)
Ending Balance (in shares) at Mar. 31, 2021 |  | 43,052,000 |  |  |  |
Ending Balance at Mar. 31, 2021 | 167,729 | $ 43 | 178,891 |  | (10,808) | (397)
Beginning Balance (in shares) at Dec. 31, 2020 |  | 42,668,000 |  |  |  |
Beginning Balance at Dec. 31, 2020 | 141,753 | $ 43 | 151,153 |  | (11,827) | 2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 18,000 |  |  |  |
Exercise of stock options | 69 |  | 69 |  |  |
Settlement of restricted stock units (in shares) |  | 289,000 |  |  |  |
Settlement of restricted stock units | (1) |  | (1) |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 77,000 |  |  |  |
Issuance of common stock under employee stock purchase plan | 793 |  | 793 |  |  |
Stock-based compensation expense | 2,968 |  | 2,968 |  |  |
Sale of convertible senior notes warrants | 23,909 |  | 23,909 |  |  |
Net income | 1,019 |  |  |  | 1,019 |
Components of comprehensive income (loss): |  |  |  |  |  |
Currency translation adjustment | (2,648) |  |  |  |  | (2,648)
Change in unrealized gain (loss) on investments | (133) |  |  |  |  | (133)
Ending Balance (in shares) at Mar. 31, 2021 |  | 43,052,000 |  |  |  |
Ending Balance at Mar. 31, 2021 | $ 167,729 | $ 43 | 178,891 |  | (10,808) | (397)
Beginning Balance (in shares) at Sep. 30, 2021 | 44,168,745 | 44,169,000 |  | (8,000) |  |
Beginning Balance at Sep. 30, 2021 | $ 192,830 | $ 44 | 199,935 | $ (140) | (6,066) | (943)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) | 25,625 | 25,000 |  |  |  |
Exercise of stock options | $ 206 |  | 206 |  |  |
Settlement of restricted stock units (in shares) |  | 973,000 |  |  |  |
Settlement of restricted stock units |  | $ 1 | (1) |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 71,000 |  |  |  |
Issuance of common stock under employee stock purchase plan | 923 |  | 923 |  |  |
Stock-based compensation expense | 6,429 |  | 6,429 |  |  |
Repurchases and retirement of common stock (in shares) |  | (894,000) |  | 8,000 |  |
Repurchases and retirement of common stock | (14,828) | $ (1) | (1) | $ 140 | (14,966) |
Net income | 4,137 |  |  |  | 4,137 |
Components of comprehensive income (loss): |  |  |  |  |  |
Currency translation adjustment | (3,129) |  |  |  |  | (3,129)
Change in unrealized gain (loss) on investments | $ (1,098) |  |  |  |  | (1,098)
Ending Balance (in shares) at Mar. 31, 2022 | 44,344,361 | 44,344,000 |  | 0 |  |
Ending Balance at Mar. 31, 2022 | $ 185,470 | $ 44 | 207,491 | $ 0 | (16,895) | (5,170)
Beginning Balance (in shares) at Dec. 31, 2021 |  | 44,297,000 |  |  |  |
Beginning Balance at Dec. 31, 2021 | 187,429 | $ 44 | 203,091 |  | (13,226) | (2,480)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 16,000 |  |  |  |
Exercise of stock options | 179 |  | 179 |  |  |
Settlement of restricted stock units (in shares) |  | 248,000 |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 71,000 |  |  |  |
Issuance of common stock under employee stock purchase plan | 923 |  | 923 |  |  |
Stock-based compensation expense | 3,298 |  | 3,298 |  |  |
Repurchases and retirement of common stock (in shares) |  | (288,000) |  |  |  |
Repurchases and retirement of common stock | (4,682) |  |  |  | (4,682) |
Net income | 1,013 |  |  |  | 1,013 |
Components of comprehensive income (loss): |  |  |  |  |  |
Currency translation adjustment | (1,862) |  |  |  |  | (1,862)
Change in unrealized gain (loss) on investments | $ (828) |  |  |  |  | (828)
Ending Balance (in shares) at Mar. 31, 2022 | 44,344,361 | 44,344,000 |  | 0 |  |
Ending Balance at Mar. 31, 2022 | $ 185,470 | $ 44 | $ 207,491 | $ 0 | $ (16,895) | $ (5,170)

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