2. Liquidity (Details) - USD ($)		Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Restricted cash		$ 800,000	$ 150,000	$ 150,000
Letter of Credit 1
Restricted cash	[1]	150,000	150,000
Letter of Credit 2
Restricted cash		400,000	0
Letter of Credit 3
Restricted cash		$ 250,000	$ 0

[1] Although the letter of credit dated July 9, 2019 expired on July 8, 2020, the restricted cash committed under this letter of credit remains in effect until the Company finalizes an administrative application requesting the release of the cash.