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Debt (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended
	Nov. 15, 2018	Mar. 08, 2018	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Feb. 27, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Debt
Gain (loss) on debt extinguishment				$ 443	$ (129)
Convertible Notes
Debt
Debt issuance costs							$ 205
Original Notes
Debt
Maximum amount of debt agreed to be issued		$ 5,000
Interest rate (as a percent)	8.00%	4.00%
Principal amount									$ 2,965	$ 2,965
Gross proceeds threshold		$ 10,000
Stock price trigger percentage	80.00%	90.00%
Multiplier applied on principal plus accrued and unpaid interest	2
Principal amount holder to be included to provide consent	$ 1,000
Percentage of Note holders to provide consent to make amendments or waivers	66.667%
Original Notes | Class B-1 preferred stock
Debt
Conversion price		$ 1.385
Percentage of voting power		50.00%
Additional Notes
Debt
Maximum amount of debt agreed to be issued	$ 8,000
Principal amount								$ 4,661
Second Amendment Notes
Debt
Maximum amount of debt agreed to be issued							$ 10,035
Principal amount						$ 5,372
Gain (loss) on debt extinguishment			$ 0		$ 129

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The maximum borrowing capacity under the debt instrument agreement.

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Percentage of holders of the principal amount of the Notes to provide consent to make any further amendments or waivers under the debt agreement.

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The price per share of the conversion feature embedded in the debt instrument.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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

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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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