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Revenue and Vendor Concentrations - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 9,670 | $ 9,105 | $ 8,522 | $ 7,404 | $ 7,866 | $ 6,440 | $ 5,672 | $ 5,389 | $ 5,544 | $ 4,660 | $ 4,484 | $ 4,463 | $ 34,701 | $ 25,367 | $ 19,150
Accounts receivable, net | 4,949 |  |  |  | 3,937 |  |  |  |  |  |  |  | 4,949 | 3,937 |
Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,300 | $ 6,300 | $ 5,700
Customer Concentration Risk [Member] | Sales Revenue Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%
Geographic Concentration Risk [Member] | Sales Revenue Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% | 5.00% | 4.00%
Customer One [Member] | Customer Concentration Risk [Member] | Sales Revenue Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% | 25.00% | 30.00%
Major Customers [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 1,000 |  |  |  | $ 1,100 |  |  |  | $ 1,400 |  |  |  | $ 1,000 | $ 1,100 | $ 1,400
Channel Partners [Member] | Supplier Concentration Risk [Member] | Sales Revenue Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |

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