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Revenue and Vendor Concentrations - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Revenue, Major Customer [Line Items] |  |  |  |  |
Revenue | $ 11,419 | $ 8,522 | $ 20,688 | $ 15,926 |
Accounts receivable, net | 5,104 |  | $ 5,104 |  | $ 4,949
Customer Concentration Risk | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Total revenue, percentage (as a percent) |  |  | 23.00% |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Accounts receivable, net | 1,400 | 100 | $ 1,400 | 100 |
Customer Concentration Risk | Two Customers | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Revenue | $ 2,900 | $ 2,100 |  | $ 3,900 |
Customer Concentration Risk | Customer One | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Total revenue, percentage (as a percent) | 14.00% | 15.00% |  | 13.00% |
Customer Concentration Risk | Customer Two | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Total revenue, percentage (as a percent) | 12.00% | 11.00% |  | 12.00% |
Customer Concentration Risk | One Customer | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Revenue |  |  | $ 4,800 |  |
Geographic Concentration Risk | Sales Revenue Net |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Total revenue, percentage (as a percent) | 14.00% | 10.00% | 12.00% | 10.00% |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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