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Nature of Operations and Summary of Significant Accounting Policies - Cumulative Effect of Adoption of ASC 606 on Consolidated Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 14,938 |  |  |  | $ 16,821 |  |  |  |  |  |  |  | $ 14,938 | $ 16,821 |  |
Contract assets | 2,350 |  |  |  |  |  |  |  |  |  |  |  | 2,350 |  |  | $ 169
Deferred income taxes, net | 16,596 |  |  |  | 15,356 |  |  |  |  |  |  |  | 16,596 | 15,356 |  | 15,089
Other non-current assets | 2,347 |  |  |  | 2,147 |  |  |  |  |  |  |  | 2,347 | 2,147 |  | 2,654
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue, current portion | 5,612 |  |  |  | 4,792 |  |  |  |  |  |  |  | 5,612 | 4,792 |  | 4,281
Deferred revenue, non-current portion | 736 |  |  |  | 485 |  |  |  |  |  |  |  | 736 | 485 |  | 485
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | (20,806) |  |  |  | (21,002) |  |  |  |  |  |  |  | (20,806) | (21,002) |  | $ (20,082)
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 25,018 | $ 21,906 | $ 19,983 | $ 17,683 | 21,037 | $ 16,109 | $ 14,277 | $ 12,136 | $ 12,904 | $ 11,798 | $ 11,419 | $ 9,269 | 84,590 | 63,559 | $ 45,390 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and marketing |  |  |  |  |  |  |  |  |  |  |  |  | 27,405 | 21,700 | 14,484 |
Software and hardware |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 46,845 | 40,698 | 29,647 |
Service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 37,745 | 22,861 | $ 15,743 |
Adjustments Due to the Adoption of ASC 606 | ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 414 |  |  |  |  |  |  |  |  |  |  |  | 414 |  |  |
Contract assets | (2,350) |  |  |  | 169 |  |  |  |  |  |  |  | (2,350) | 169 |  |
Deferred income taxes, net | 822 |  |  |  | (267) |  |  |  |  |  |  |  | 822 | (267) |  |
Other non-current assets | (596) |  |  |  | 507 |  |  |  |  |  |  |  | (596) | 507 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue, current portion | 1,124 |  |  |  | (511) |  |  |  |  |  |  |  | 1,124 | (511) |  |
Deferred revenue, non-current portion | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |  |
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | (2,834) |  |  |  | 920 |  |  |  |  |  |  |  | (2,834) | 920 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | (2,454) |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and marketing |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |
Adjustments Due to the Adoption of ASC 606 | ASC 606 | Software and hardware |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | (2,454) |  |  |
Adjustments Due to the Adoption of ASC 606 | ASC 606 | Service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Balances without adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 15,352 |  |  |  |  |  |  |  |  |  |  |  | 15,352 |  |  |
Contract assets | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |  |
Deferred income taxes, net | 17,418 |  |  |  | 15,356 |  |  |  |  |  |  |  | 17,418 | 15,356 |  |
Other non-current assets | 1,751 |  |  |  | 2,147 |  |  |  |  |  |  |  | 1,751 | 2,147 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue, current portion | 6,736 |  |  |  | 4,792 |  |  |  |  |  |  |  | 6,736 | 4,792 |  |
Deferred revenue, non-current portion | 736 |  |  |  | 485 |  |  |  |  |  |  |  | 736 | 485 |  |
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (23,640) |  |  |  | $ (21,002) |  |  |  |  |  |  |  | (23,640) | $ (21,002) |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 82,136 |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and marketing |  |  |  |  |  |  |  |  |  |  |  |  | 27,420 |  |  |
Balances without adoption of ASC 606 | Software and hardware |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 44,391 |  |  |
Balances without adoption of ASC 606 | Service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,745 |  |  |

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