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Debt - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 20, 2019 USD ($) | Mar. 29, 2019 | Dec. 17, 2018 USD ($) | Nov. 05, 2018 | Aug. 08, 2018 USD ($) | Sep. 30, 2019 USD ($) tranche repayment | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) invoice
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt arrangement | $ 15,542,000 |  |  |  |  |  | $ 15,542,000 |  | $ 16,630,000
Number of customer invoices factored | invoice |  |  |  |  |  |  |  |  | 1
Foreign subsidiary borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Receivables pledged as collateral | $ 672,000 |  |  |  |  |  | $ 672,000 |  | $ 629,000
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 |  |
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%
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 |  |  |
Accordion feature, increase limit |  |  |  |  |  | $ 10,000 |  |  |
Weighted average interest rate, revolving credit facility | 3.60% |  |  |  |  |  | 3.60% |  | 3.90%
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 |  | 131,000
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  | 1.50% |  |  |
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
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% |  | 3.69%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  | 1.25% |  |  |  |  |
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 |
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] |  |  |  |  |  |  |  |  |
Receivables pledged as collateral | $ 24,000,000 |  |  |  |  |  | $ 24,000,000 |  | $ 24,496,000
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 |  |  |  |  |  |  |
Line of credit facility, collateral springs | $ 2,400,000 |  |  |  |  |  | 2,400,000 |  |
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 |  |
Remaining borrowing capacity | 7,709,000 |  |  |  |  |  | 7,709,000 |  | $ 7,049,000
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 | $ 3,500,000 |  |  |  |  |  | $ 3,500,000 |  |

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