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Debt - Credit Facilities (Details)	Aug. 11, 2020 USD ($) creditFacility	Dec. 11, 2018 USD ($)	Jun. 30, 2021 USD ($)	Apr. 20, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2020 creditFacility	Jun. 30, 2020 USD ($)
Line of Credit Facility [Line Items]
Number of debt financing facilities | creditFacility	2					2
Credit line borrowings, net of loan origination fees			$ 1,573,000		$ 2,298,000
Revolving Credit Facility | Inventory Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity on line of credit	$ 3,000,000.0			$ 3,500,000
Inventory costs	75.00%
Inventory, net orderly liquidation value	85.00%
Interest rate	5.75%		21.62%		23.60%
Monthly service fee	1.00%
Minimum monthly fee	$ 18,000
Credit line borrowings, net of loan origination fees			$ 1,200,000		$ 1,300,000
Amortized net issuance costs			$ 100,000		$ 100,000
Revolving Credit Facility | Inventory Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate	4.00%
Revolving Credit Facility | Receivables Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity on line of credit	$ 2,500,000
Interest rate			8.10%		7.90%
Monthly service fee	1.00%
Minimum monthly fee	$ 25,000
Percent of accounts receivable used as borrowing capacity	90.00%
Stated interest rate on collateral management fee			6.00%		6.00%
Credit line borrowings, net of loan origination fees			$ 400,000		$ 1,000,000.0
Amortized net issuance costs			$ 20,000		$ 40,000
Revolving Credit Facility | Receivables Facility | Prime Rate
Line of Credit Facility [Line Items]
Interest rate	2.00%
Revolving Credit Facility | Austin Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity on line of credit		$ 5,000,000.0
Interest rate							5.25%
Credit line borrowings, net of loan origination fees							$ 1,300,000
Line of credit term (in years)		3 years
Annual facility fee		1.00%
Annual facility fee, payment period		3 years
Collateral management fee		0.50%
Payment to close Austin credit facility	$ 1,400,000
Termination fee	100,000
Write off of remaining issuance costs	$ 59,000
Revolving Credit Facility | Austin Facility | Prime Rate
Line of Credit Facility [Line Items]
Margin added to borrowing rate		2.00%

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Debt Instrument, Interest Rate, Stated Percentage, Collateral Management Fee

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Debt Instrument, Number Of Credit Facilities

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Line Of Credit Facility, Annual Facility Fee, Period

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Line of Credit Facility, Borrowing Capacity, Inventory Costs, Percent

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Line of Credit Facility, Borrowing Capacity, Inventory Value, Percent

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Line of Credit Facility, Borrowing Capacity, Value Of Accounts Receivable, Percent

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Line Of Credit Facility, Collateral Management Fee

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Line Of Credit Facility, Monthly Facility Fee

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Line Of Credit Facility, Monthly Facility Fee, Percent

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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