Debt - Schedule of debt balances (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt issuance costs	$ (488)	$ (612)
Total debt outstanding	30,512	30,388
Less: current portion of long-term debt	9,087	0
Long-term debt	21,425	30,388
Loan Facility \| 2018 Term Loan Facility
Debt Instrument [Line Items]
Debt, outstanding balance	20,000	20,000
Loan Facility \| Equipment financing loan
Debt Instrument [Line Items]
Debt, outstanding balance	5,000	5,000
2018 Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt, outstanding balance	$ 6,000	$ 6,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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