Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Disclosure [Abstract]
Secured loan agreement, description	During the three months ended March 31, 2022 (a) $2.8 million of Notes A and B principal was satisfied by $1.9 million (plus interest) of aggregate payments in cash, plus aggregate conversions of principal and interest of $0.9 million and $44,000, respectively, into an aggregate of 1,576,058 shares of the Company’s common stock; (b) $0.5 million of Note C past due principal was repaid in cash; (c) $5.2 million of Note D (the Tucson Building mortgage) was repaid in cash from the proceeds of the January 31, 2022 building sale; and (d) an aggregate of $16,000 of Notes E, F, and G principal were repaid in cash. The conversions of Notes A and B were pursuant to a share-settled redemption feature wherein the conversions are required to be accounted for under extinguishment accounting, which resulted in the recognition of a $173,000 loss on extinguishment.
Interest expense	$ 880,000	$ 469,000