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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2019 |  | 40,367,000 |  |  |
Beginning Balance at Sep. 30, 2019 | $ 107,333 | $ 40 | $ 132,160 | $ (20,806) | $ (4,061)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) |  | 185,000 |  |  |
Exercise of stock options | 645 |  | 645 |  |
Settlement of restricted stock units (in shares) |  | 586,000 |  |  |
Settlement of restricted stock units | 0 | $ 1 | (1) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 75,000 |  |  |
Issuance of common stock under employee stock purchase plan | 606 |  | 606 |  |
Stock-based compensation expense | 4,611 |  | 4,611 |  |
Repurchases and retirements of common stock (in shares) |  | (137,000) |  |  |
Repurchases and retirements of common stock | (1,002) |  |  | (1,002) |
Components of other comprehensive income (loss): |  |  |  |  |
Net income | 1,468 |  |  | 1,468 |
Foreign currency translation adjustment | 189 |  |  |  | 189
Unrealized gain (loss) on investments | 58 |  |  |  | 58
Other comprehensive income (loss) | 1,715 |  |  |  |
Ending Balance (in shares) at Mar. 31, 2020 |  | 41,076,000 |  |  |
Ending Balance at Mar. 31, 2020 | 113,908 | $ 41 | 138,021 | (20,340) | (3,814)
Beginning Balance (in shares) at Dec. 31, 2019 |  | 40,865,000 |  |  |
Beginning Balance at Dec. 31, 2019 | 111,524 | $ 41 | 134,535 | (20,246) | (2,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) |  | 161,000 |  |  |
Exercise of stock options | 572 |  | 572 |  |
Settlement of restricted stock units (in shares) |  | 112,000 |  |  |
Settlement of restricted stock units | 0 |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 75,000 |  |  |
Issuance of common stock under employee stock purchase plan | 606 |  | 606 |  |
Stock-based compensation expense | 2,308 |  | 2,308 |  |
Repurchases and retirements of common stock (in shares) |  | (137,000) |  |  |
Repurchases and retirements of common stock | (1,002) |  |  | (1,002) |
Components of other comprehensive income (loss): |  |  |  |  |
Net income | 908 |  |  | 908 |
Foreign currency translation adjustment | (1,064) |  |  |  | (1,064)
Unrealized gain (loss) on investments | 56 |  |  |  | 56
Other comprehensive income (loss) | (100) |  |  |  |
Ending Balance (in shares) at Mar. 31, 2020 |  | 41,076,000 |  |  |
Ending Balance at Mar. 31, 2020 | $ 113,908 | $ 41 | 138,021 | (20,340) | (3,814)
Beginning Balance (in shares) at Sep. 30, 2020 | 41,779,853 | 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) | 259,865 | 260,000 |  |  |
Exercise of stock options | $ 1,958 |  | 1,958 |  |
Settlement of restricted stock units (in shares) |  | 935,000 |  |  |
Settlement of restricted stock units | 0 | $ 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 |  |
Repurchases and retirements of common stock | 0 |  |  |  |
Components of other comprehensive income (loss): |  |  |  |  |
Net income | 3,186 |  |  | 3,186 |
Foreign currency translation adjustment | 112 |  |  |  | 112
Unrealized gain (loss) on investments | (186) |  |  |  | (186)
Other comprehensive income (loss) | $ 3,112 |  |  |  |
Ending Balance (in shares) at Mar. 31, 2021 | 43,052,478 | 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 |  |
Components of other comprehensive income (loss): |  |  |  |  |
Net income | 1,019 |  |  | 1,019 |
Foreign currency translation adjustment | (2,648) |  |  |  | (2,648)
Unrealized gain (loss) on investments | (133) |  |  |  | (133)
Other comprehensive income (loss) | $ (1,762) |  |  |  |
Ending Balance (in shares) at Mar. 31, 2021 | 43,052,478 | 43,052,000 |  |  |
Ending Balance at Mar. 31, 2021 | $ 167,729 | $ 43 | $ 178,891 | $ (10,808) | $ (397)

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