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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2014 | $ 23,942,000 | $ 31,000 | $ 59,946,000 | $ (36,027,000) | $ (8,000)
Beginning Balance (in shares) at Sep. 30, 2014 |  | 30,521,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options | $ 246,000 |  | 246,000 |  |
Exercise of stock options (in shares) | 232,203 | 232,000 |  |  |
Settlement of restricted stock units | $ 0 |  |  |  |
Settlement of restricted stock units (in shares) |  | 255,000 |  |  |
Acquisition-related closing shares | 347,000 | $ 1,000 | 346,000 |  |
Acquisition-related closing shares (in shares) |  | 713,000 |  |  |
Stock-based compensation expense | 3,367,000 |  | 3,367,000 |  |
Components of other comprehensive income: |  |  |  |  |
Net income | 2,526,000 |  |  | 2,526,000 |
Currency translation adjustment | 0 |  |  |  |
Change in unrealized gain (loss) on investments | 5,000 |  |  |  | 5,000
Other comprehensive income | 2,531,000 |  |  |  |
Ending Balance at Sep. 30, 2015 | 30,433,000 | $ 32,000 | 63,905,000 | (33,501,000) | (3,000)
Ending Balance (in shares) at Sep. 30, 2015 |  | 31,721,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options | $ 1,755,000 | $ 1,000 | 1,754,000 |  |
Exercise of stock options (in shares) | 661,663 | 662,000 |  |  |
Settlement of restricted stock units | $ 0 |  |  |  |
Settlement of restricted stock units (in shares) |  | 262,000 |  |  |
Acquisition-related closing shares | 0 |  |  |  |
Acquisition-related closing shares (in shares) |  | 137,000 |  |  |
Stock-based compensation expense | 4,079,000 |  | 4,079,000 |  |
Amortization of closing shares and earnout shares | 1,298,000 |  | 1,298,000 |  |
Components of other comprehensive income: |  |  |  |  |
Net income | 1,959,000 |  |  | 1,959,000 |
Currency translation adjustment | (46,000) |  |  |  | (46,000)
Change in unrealized gain (loss) on investments | 7,000 |  |  |  | 7,000
Other comprehensive income | 1,920,000 |  |  |  |
Ending Balance at Sep. 30, 2016 | $ 39,485,000 | $ 33,000 | 71,036,000 | (31,542,000) | (42,000)
Ending Balance (in shares) at Sep. 30, 2016 | 32,781,704 | 32,782,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options | $ 687,000 |  | 687,000 |  |
Exercise of stock options (in shares) | 235,514 | 235,000 |  |  |
Settlement of restricted stock units | $ 0 | $ 1,000 | (1,000) |  |
Settlement of restricted stock units (in shares) |  | 707,000 |  |  |
Stock-based compensation expense | 5,478,000 |  | 5,478,000 |  |
Amortization of closing shares and earnout shares | 1,477,000 |  | 1,477,000 |  |
Components of other comprehensive income: |  |  |  |  |
Net income | 14,092,000 |  |  | 14,092,000 |
Currency translation adjustment | 208,000 |  |  |  | 208,000
Change in unrealized gain (loss) on investments | (19,000) |  |  |  | (19,000)
Other comprehensive income | 14,281,000 |  |  |  |
Ending Balance at Sep. 30, 2017 | $ 61,408,000 | $ 34,000 | $ 78,677,000 | $ (17,450,000) | $ 147,000
Ending Balance (in shares) at Sep. 30, 2017 | 33,724,392 | 33,724,000 |  |  |

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