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Debt - Narrative (Details) |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 20, 2019 USD ($) | Aug. 08, 2018 USD ($) | Sep. 30, 2019 USD ($) tranche repayment | Dec. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) invoice | Sep. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 17, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt arrangement |  | $ 15,542,000 |  |  | $ 15,542,000 |  | $ 11,302,000 | $ 15,542,000 |  |
Number of customer invoices factored | invoice |  |  |  |  |  |  | 1 |  |  |
Foreign subsidiary borrowings |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Receivables pledged as collateral |  | 672,000 |  |  | $ 672,000 |  | $ 1,322,000 | 672,000 |  |
Long-term debt, number of tranches with modified repayment schedule | tranche |  |  |  |  | 1 |  |  |  |  |
Debt instrument, number of repayments reduced | repayment |  |  |  |  | 2 |  |  |  |  |
Debt instrument, repayment reduction per payment, amount |  |  |  |  | $ 96,000 |  |  |  |  |
Debt instrument, loan extension period |  |  |  |  | 6 months |  |  |  |  |
Remaining debt balance |  | $ 6,592,000 |  |  | $ 6,592,000 |  | $ 5,159,000 | $ 6,592,000 |  |
Foreign subsidiary borrowings | Euribor | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Euribor variable interest rates |  |  |  |  |  |  | 1.00% |  |  |
Foreign subsidiary borrowings | Euribor | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Euribor variable interest rates |  |  |  |  |  |  | 4.24% |  |  |
2018 Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  | 1.1 |  |  |  |  |  |
Percent availability under revolving commitment |  |  |  | 12.50% |  |  |  |  |  |
Percentage of stock pledged on credit agreement |  |  | 66.67% |  |  |  |  |  |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | $ 30,000,000 |  |  |  |  |  |
Accordion feature, increase limit |  |  |  | $ 10,000,000 |  |  |  |  |  |
Weighted average interest rate, revolving credit facility |  | 3.60% |  |  | 3.60% |  | 1.70% | 3.60% |  |
Commitment fee percentage |  |  |  |  |  |  | 0.25% |  |  |
Debt issuance costs incurred |  |  |  |  |  |  | $ 212,000 |  |  |
Revolving line of credit, accumulated amortization of debt issuance costs |  | $ 106,000 |  |  | $ 106,000 |  | $ 180,000 | $ 106,000 |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement | LIBOR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  |  | 1.50% |  |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 5,000,000
Accordion feature, increase limit |  |  |  |  |  |  |  |  |  | $ 35,000,000
Weighted average interest rate, revolving credit facility |  | 3.40% |  |  | 3.40% |  | 1.20% | 3.40% |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | LIBOR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  |  | 1.00% | 1.25% |  |
Third Amendment to Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Coverage ratio threshold for three or more business days in consecutive thirty day period |  |  | 12.50% |  |  |  |  |  |  |
Fourth Amendment to Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  | 1.1 |  |  |  |  |  |
Percent availability under revolving commitment |  |  | 10.00% |  |  |  |  |  |  |
Coverage ratio threshold for three or more business days in consecutive thirty day period |  | 10.00% | 10.00% |  |  |  |  |  |  |
Line of credit facility, benchmark of collateral threshold |  |  | $ 20,000,000 |  |  |  |  |  |  |
Receivables pledged as collateral |  | $ 24,000,000 |  |  | $ 24,000,000 |  | $ 25,603,000 | $ 24,000,000 |  |
Fourth Amendment to Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | 35,000,000 |  |  | 35,000,000 |  |  | 35,000,000 | $ 35,000,000 |
Line of credit facility, covenant terms, floor |  |  | 2,000,000 |  |  |  |  |  |  |
Line of credit facility, benchmark of collateral threshold |  |  | $ 20,000,000 |  |  |  |  |  |  |
Line of credit facility, total commitment springs |  | 2,400,000 |  |  | 2,400,000 |  | 2,560,000 | 2,400,000 |  |
Remaining borrowing capacity |  | 7,709,000 |  |  | 7,709,000 |  | 13,492,000 | 7,709,000 |  |
Short Term Debt Arrangement for Working Capital Purposes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 6 months |  |  |  |
Short-term debt arrangement |  |  |  |  |  | $ 1,137,000 |  |  |  |
First And Second Amendment to 2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  | $ 75,000 |  |  | $ 75,000 |  |  | $ 75,000 |  |
PPP Loan | Unsecured Promissory Note |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 2 years |  |  |  |  |  |  |  |  |
Face amount | $ 5,025,000 |  |  |  |  |  |  |  |  |
Interest rate | 0.98% |  |  |  |  |  |  |  |  |
Deferral term | 6 months |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A. | PPP Loan | Unsecured Promissory Note |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment debt |  |  |  |  |  |  | 261,000 |  |  |
Remaining debt balance |  |  |  |  |  |  | 4,764,000 |  |  |
Long-term debt paid in 2021 |  |  |  |  |  |  | 2,382,000 |  |  |
Long-term debt paid in 2022 |  |  |  |  |  |  | $ 2,382,000 |  |  |

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