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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, 2016 |  | 32,782,000 |  |  |
Beginning Balance at Sep. 30, 2016 | $ 39,485 | $ 33 | $ 71,036 | $ (31,542) | $ (42)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) | 235,514 | 235,000 |  |  |
Exercise of stock options | $ 687 |  | 687 |  |
Settlement of restricted stock units (in shares) |  | 707,000 |  |  |
Settlement of restricted stock units | 0 | $ 1 | (1) |  |
Stock-based compensation expense | 5,478 |  | 5,478 |  |
Amortization of closing shares and earnout shares | 1,477 |  | 1,477 |  |
Components of other comprehensive income (loss): |  |  |  |  |
Net income (loss) | 14,092 |  |  | 14,092 |
Currency translation adjustment | 208 |  |  |  | 208
Change in unrealized gain (loss) on investments | (19) |  |  |  | (19)
Other comprehensive income (loss) | 14,281 |  |  |  |
Ending Balance (in shares) at Sep. 30, 2017 |  | 33,724,000 |  |  |
Ending Balance at Sep. 30, 2017 | $ 61,408 | $ 34 | 78,677 | (17,450) | 147
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) | 250,823 | 251,000 |  |  |
Exercise of stock options | $ 743 |  | 743 |  |
Settlement of restricted stock units (in shares) |  | 745,000 |  |  |
Settlement of restricted stock units | 0 | $ 1 | (1) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 61,000 |  |  |
Issuance of common stock under employee stock purchase plan | 382 |  | 382 |  |
Stock-based compensation expense | 8,950 |  | 8,950 |  |
Acquisition-related shares issued (in shares) |  | 3,180,000 |  |  |
Acquisition-related shares issued | 27,486 | $ 3 | 27,483 |  |
Amortization of closing shares and earnout shares | 710 |  | 710 |  |
Components of other comprehensive income (loss): |  |  |  |  |
Net income (loss) | (11,807) |  |  | (11,807) |
Currency translation adjustment | (723) |  |  |  | (723)
Change in unrealized gain (loss) on investments | (10) |  |  |  | (10)
Other comprehensive income (loss) | $ (12,540) |  |  |  |
Ending Balance (in shares) at Sep. 30, 2018 | 37,961,224 | 37,961,000 |  |  |
Ending Balance at Sep. 30, 2018 | $ 95,394 | $ 38 | 116,944 | (21,002) | (586)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) | 1,384,647 | 1,385,000 |  |  |
Exercise of stock options | $ 4,500 | $ 1 | 4,499 |  |
Settlement of restricted stock units (in shares) |  | 881,000 |  |  |
Settlement of restricted stock units | 0 | $ 1 | (1) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 140,000 |  |  |
Issuance of common stock under employee stock purchase plan | 1,081 |  | 1,081 |  |
Stock-based compensation expense | 9,637 |  | 9,637 |  |
Components of other comprehensive income (loss): |  |  |  |  |
Net income (loss) | (724) |  |  | (724) |
Currency translation adjustment | (3,504) |  |  |  | (3,504)
Change in unrealized gain (loss) on investments | 29 |  |  |  | 29
Other comprehensive income (loss) | $ (4,199) |  |  |  |
Ending Balance (in shares) at Sep. 30, 2019 | 40,367,456 | 40,367,000 |  |  |
Ending Balance at Sep. 30, 2019 | $ 107,333 | $ 40 | $ 132,160 | $ (20,806) | $ (4,061)

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