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Fixed Assets - Lease costs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lease cost:
Operating lease cost	$ 46,000	$ 62,000
Short-term lease cost	5,000
Total lease cost	$ 51,000	62,000
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$ 53,000
For operating lease:
Weighted average remaining lease term (in years)		4 years 5 months 19 days
Weighted average discount rate		5.98%

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Cash payments to lessor's for use of assets under operating leases.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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