Debt - Narrative (Details) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Nov. 09, 2016	Nov. 30, 2016	Jun. 30, 2018	Sep. 30, 2017	Aug. 04, 2017	Aug. 03, 2017	Nov. 08, 2016
Line of Credit Facility [Line Items]
Revolver			$ 19,492,000	$ 18,557,000
Foreign debt borrowings, long-term debt, current portion			6,071,000	7,560,000
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Outstanding borrowings			7,398,000	8,346,000
Foreign debt borrowings, current			4,973,000	5,805,000
Revolver			2,368,000	2,618,000
Foreign debt borrowings, long-term debt, current portion			1,432,000	1,340,000
Foreign debt borrowings, factoring payable, current			1,173,000	1,847,000
Receivables pledged as collateral, carrying value			$ 2,641,000	3,548,000
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates			1.00%
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates			4.00%
Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 39,871,000
Debt issuance costs incurred				64,000
Debt issuance costs, net		$ 785,000
Debt issuance costs related to the term loan and revolving credit facility, gross			$ 868,000
Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving line of credit, debt Issuance costs incurred, gross			793,000
Revolving line of credit, accumulated amortization of debt issuance costs			327,000
Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on LIBOR	3.75%
Credit Facility | Term Loan
Line of Credit Facility [Line Items]
Issued amount of debt	$ 4,871,000
Installment payment	$ 81,000
Fixed interest rate after effect of interest rate swap	5.80%
Debt issuance costs incurred			75,000
Accumulated amortization of debt issuance costs			$ 29,000
Credit Facility | Term Loan | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on LIBOR			4.25%
Weighted average interest rate, revolving credit facility			6.30%
Credit Facility | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 35,000,000
Credit Facility | Revolving credit agreement | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.15%
Credit Facility | Revolving credit agreement | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.375%
Credit Facility | Revolving credit agreement | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Weighted average interest rate, revolving credit facility			5.70%
Second Amendment | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity					$ 30,000,000	$ 35,000,000
Second Amendment | Term Loan
Line of Credit Facility [Line Items]
Reduction of term facility					$ 700,000
2015 Credit Agreement
Line of Credit Facility [Line Items]
Debt issuance costs incurred		497,000					$ 724,000
Write off of deferred debt issuance cost due to debt modification		$ 241,000		$ 81,000
Credit Agreement Third Amendment
Line of Credit Facility [Line Items]
Debt issuance costs incurred			$ 100,000