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REVENUE AND VENDOR CONCENTRATIONS - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	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, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 12,904	$ 11,798	$ 11,419	$ 9,269	$ 9,670	$ 9,105	$ 8,522	$ 7,404	$ 7,866	$ 6,440	$ 5,672	$ 5,389	$ 45,390	$ 34,701	$ 25,367
Accounts receivable, net	7,099				4,949								7,099	4,949
Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 1,300				$ 1,000				$ 1,100				$ 1,300	$ 1,000	$ 1,100
Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%	10.00%	10.00%
Geographic Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													14.00%	15.00%	5.00%
Customer One | Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Revenue													$ 10,400	$ 6,300	$ 6,300
Total revenue, percentage													23.00%	18.00%	25.00%
Channel Partners | Supplier Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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