Credit Arrangements - Additional Information (Detail)				12 Months Ended
	Oct. 05, 2015 USD ($)	May 13, 2015 USD ($) $ / shares shares	Jan. 27, 2015 USD ($) Installment	Sep. 30, 2016 USD ($) Installment	Sep. 30, 2015 USD ($)	Dec. 09, 2016 USD ($)	Dec. 14, 2015 USD ($)	Aug. 12, 2015 $ / shares	May 12, 2015 USD ($)
Line of Credit Facility [Line Items]
Carrying value of debt					$ 1,347,000
Warrant debt expiration date				May 14, 2020
Fair value of the derivative liability				$ 67,000	109,000
Change in the fair value of the derivative liability, Gain recorded				$ 58,000	11,000
Warrant Debt [Member]
Line of Credit Facility [Line Items]
Carrying value of debt							$ 178,000		$ 178,000
Warrant debt interest rate				0.00%
Fair value of the derivative liability				$ 58,000
Derivative fair value				(120,000)
Debt discount accreted as interest expense				$ 178,000
Debt interest expense term				5 years
PFG Debt [Member]
Line of Credit Facility [Line Items]
Annual interest rate				10.75%
Carrying value of debt							$ 1,322,000		$ 1,322,000
Debt interest expense term				3 years
Accretion of discount expense				$ 17,000	5,000
Amortization of debt discount				71,000	22,000
Debt instrument, outstanding amount				1,300,000	1,500,000
Silicon Valley Bank [Member]
Line of Credit Facility [Line Items]
Foreign receivables accounts		$ 1,000,000
Adjusted quick ratio		1.35
Debt service net change in deferred revenue	$ 1.00
Notes payable outstanding				$ 1,100,000	1,900,000
Annual interest rate				6.25%
Remaining amount available for advance				$ 2,300,000
Silicon Valley Bank [Member] | Modification No. 1 to Loan and Security Agreement [Member]
Line of Credit Facility [Line Items]
Debt service net change in deferred revenue	$ 1.00
Silicon Valley Bank [Member] | For the Quarters Ending June 30, 2015 [Member]
Line of Credit Facility [Line Items]
Debt service coverage ratio		1.0
Silicon Valley Bank [Member] | For the Quarter Ending September 30, 2015 [Member]
Line of Credit Facility [Line Items]
Debt service coverage ratio		1.25
Silicon Valley Bank [Member] | For the Quarter Ending December 31, 2015 [Member]
Line of Credit Facility [Line Items]
Debt service coverage ratio		1.50
Silicon Valley Bank [Member] | Monthly Basis [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.5
Silicon Valley Bank [Member] | Monthly Basis [Member] | Modification No. 1 to Loan and Security Agreement [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.5
Silicon Valley Bank [Member] | Each Month-End that is Not the Last Day of Fiscal Quarter [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.35
Silicon Valley Bank [Member] | Each Month-End that is Not the Last Day of Fiscal Quarter [Member] | Modification No. 1 to Loan and Security Agreement [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.35
Silicon Valley Bank [Member] | Each Month-End that is the Last Day of Fiscal Quarter [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.5
Silicon Valley Bank [Member] | Each Month-End that is the Last Day of Fiscal Quarter [Member] | Modification No. 1 to Loan and Security Agreement [Member]
Line of Credit Facility [Line Items]
Debt instrument covenant liquidity minimum ratio	1.5
Partners for Growth IV, L.P. [Member]
Line of Credit Facility [Line Items]
Carrying value of debt		$ 2,000,000
Warrant issued to purchase shares of common stock | shares		50,000
Exercise price of warrant | $ / shares		$ 9.66						$ 6.80
Exchange price of warrants		$ 200,000
Warrant exercise term		5 years
Change in the fair value of the derivative liability, Gain recorded				69,000
Partners for Growth IV, L.P. [Member] | Warrant [Member]
Line of Credit Facility [Line Items]
Fair value of the derivative liability				$ 67,000
Secured Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under secured revolving line of credit			$ 4,000,000
Revolving loan maturity date				Jan. 31, 2017
Interest rate payable on subordinate note			6.25%
Notes payable outstanding				$ 1,600,000	$ 1,400,000
Annual interest rate				4.75%
Number of equal monthly installments | Installment			36
Secured Revolving Line of Credit [Member] | Subsequent Event [Member] | Eighth Amendment [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under secured revolving line of credit						$ 1,000,000
Prior to Second Amendment [Member]
Line of Credit Facility [Line Items]
Adjusted quick ratio as above Silicon Valley Bank's prime rate				1.25%
Second Amended Agreement [Member]
Line of Credit Facility [Line Items]
Interest accrued on revolving line of credit				4.75%
Percentage of advance rate on domestic receivables				80.00%
Advance rate on foreign receivables				75.00%
Total term loan			$ 2,500,000
Term Loan [Member] | Silicon Valley Bank [Member]
Line of Credit Facility [Line Items]
Interest accrued on revolving line of credit		2.75%
Last Day Of Fiscal Quarter [Member] | Silicon Valley Bank [Member]
Line of Credit Facility [Line Items]
Adjusted quick ratio		1.50
Tranche One [Member] | Partners for Growth IV, L.P. [Member]
Line of Credit Facility [Line Items]
Revolving loan maturity date				May 01, 2018
Carrying value of debt		$ 1,500,000
Term loan interest rate		10.75%
Number of equal monthly installments | Installment				30
Term loan payment terms				30 equal monthly principal installments, plus accrued interest, beginning December 1, 2015 and continuing until May 1, 2018
Warrant issued to purchase shares of common stock | shares		37,500
Tranche Two [Member] | Partners for Growth IV, L.P. [Member]
Line of Credit Facility [Line Items]
Carrying value of debt		$ 500,000
Number of equal monthly installments | Installment				29
Warrant issued to purchase shares of common stock | shares		12,500