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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Debt Instrument, Covenant, Maximum Capital Expenditures

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Debt Instrument, Covenant, Minimum Liquid Assets

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Debt Instrument, Covenant, Minimum Net Worth

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Debt Instrument, Termination Fee Percentage

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Amount of Earnings before interest, taxes, depreciation & amortization.

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Line Of Credit Facility, Capacity Available To Convert To Incremental Term Loans, Minimum Amount

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Amount of loan to be repaid as a percentage of Excess cash flow during the period.

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Maximum Prepayment Of Debt Amount.

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Number of loans in loan agreement.

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Debt - Xcel Loan Narrative (Details)		3 Months Ended		6 Months Ended
Debt - Xcel Loan Narrative (Details)	Feb. 11, 2019 USD ($) loan	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Feb. 10, 2019 USD ($)
Debt
Loss on extinguishment of debt		$ 0	$ 0	$ 0	$ (189,000)
Interest expense		299,000	348,000	593,000	638,000
Xcel Term Loan
Debt
Face amount of loan						$ 14,500,000
Capacity available to convert to incremental term loans	$ 5,000,000
Maximum Prepayment Of Debt Amount	$ 750,000
Interest expense		$ 285,000	$ 326,000	$ 572,000	$ 586,000
Effective interest rate (as percentage)		6.60%	6.80%	6.60%	6.80%
Loan To Be Repaid As Percentage Of Excess Cash Flow Percent		50.00%
Xcel Term Loan A
Debt
Stated interest rate (as percentage)	5.10%
Xcel Term Loan B
Debt
Stated interest rate (as percentage)	6.25%
Second Amended And Restated Loan And Security Agreement
Debt
Minimum net worth required to meet loan covenant	$ 90,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan
Debt
Face amount of loan	$ 22,000,000
Number of term loans \| loan	2
Loss on extinguishment of debt			$ 200,000
Upfront fee for debt issuance	$ 90,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Through December 31, 2020
Debt
Minimum liquid assets to meet loan covenants	3,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Fiscal quarters ending March 31, 2021 through September 30, 2021
Debt
Minimum liquid assets to meet loan covenants	2,500,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Fiscal quarter ending December 31, 2021
Debt
Minimum liquid assets to meet loan covenants	3,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| After December 31 2021
Debt
Minimum liquid assets to meet loan covenants	5,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Twelve fiscal month period ended March 31, 2020
Debt
Minimum EBITDA to meet loan covenants	5,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Twelve fiscal month period ending June 30, 2020
Debt
Minimum EBITDA to meet loan covenants	4,800,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Twelve Month Fiscal Period Ending September 30 2020 [Member]
Debt
Minimum EBITDA to meet loan covenants	5,000,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Fiscal year ending December 31, 2020
Debt
Maximum capital expenditures required to meet loan covenants	1,600,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan \| Fiscal year beginning after December 31, 2020
Debt
Maximum capital expenditures required to meet loan covenants	700,000
Second Amended And Restated Loan And Security Agreement \| Additional Term Loan
Debt
Face amount of loan	7,500,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan A
Debt
Face amount of loan	7,300,000
Second Amended And Restated Loan And Security Agreement \| Xcel Term Loan B
Debt
Face amount of loan	$ 14,700,000
Revolving Credit Facility \| Xcel Term Loan \| Base Rate
Debt
Basis spread on variable rate	2.00%
Debt Termination Period, On Or Before Second Anniversary \| Xcel Term Loan A
Debt
Termination fee percentage	1.00%
Debt Termination Period, On Or Before Second Anniversary \| Xcel Term Loan B
Debt
Termination fee percentage	2.00%
Debt Termination Period, After Second Anniversary But Before Third Anniversary \| Xcel Term Loan A
Debt
Termination fee percentage	0.50%
Debt Termination Period, After Second Anniversary But Before Third Anniversary \| Xcel Term Loan B
Debt
Termination fee percentage	1.00%
Debt Termination Period, After Third Anniversary
Debt
Termination fee percentage	0.00%