Stock Authorization And Issuance (Tables)	12 Months Ended
	Dec. 31, 2021
Stock Authorization and Issuance [Abstract]
Summary Of Equity Offerings	The following table presents a summary of completed equity-based financing transactions for the years ended December 31, 2020 and 2021 (in thousands, except for per share amounts): DateTransaction # of Common Shares/ Units Sold Average Price per Share/ Unit # of Warrants Issued‎(in 000’s) Average Exercise Price per Warrant Net Proceeds (1)January 2020Private placement of common stock 1,335 $0.13 - - $ 177February 2020Warrant amendment - - 5,000 $0.74 $ -March 2020Private placement of common stock, amended to add CPR 2,571 $0.35 - - $ 900April 2020 to December 2020Private placement of common stock with CPRs 10,858 $0.35 - - $ 3,724January 2021Private placement of common stock with CPRs 2,976 $0.35 - - $ 1,040March 2021Private placement of common stock with warrants 3,231 $1.29 1,619 $1.75 $ 4,156December 2021Private placement of common stock with warrants 1,053 $0.95 526 $1.00 $ 1,000 (1)After deduction of applicable offering costs. Net proceeds are inclusive of the value of the CPRs that are classified as long-term debt (see Note 9).