Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Current portion note receivable from related parties	$ 3,631	$ 4,005
Accounts payable due to related parties	$ 55	$ 180
Series B convertible preferred stock, par value	$ 10	$ 10
Series B convertible preferred stock, liquidation value	$ 100	$ 100
Series B convertible preferred stock, shares authorized	100	100
Series B convertible preferred stock, shares issued	1	1
Series B convertible preferred stock, shares outstanding	1	1
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	5,131,934	5,131,934
Common Stock, Shares Outstanding	5,131,934	5,131,934