Debt - Schedule of debt balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt issuance costs	$ (431)	$ (612)
Total debt outstanding	30,569	30,388
Less: current portion of long-term debt	11,000	0
Long-term debt	19,569	30,388
2018 Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt, outstanding balance	6,000	6,000
2018 Term Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Debt, outstanding balance	20,000	20,000
Equipment Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Debt, outstanding balance	$ 5,000	$ 5,000

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
-Publisher FASB
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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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