Common Stock and Common Stock Purchase Warrants (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jan. 29, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock option exercised, value	$ 242	$ 80
Class of warrant or right, exercise price of warrants or rights	$ 1.60			$ 1.68
Series W Warrants [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Class of warrant or right outstanding			377,873
Series Z Warrants [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Number of warrants exercised	5
Class of warrant or right, exercise price of warrants or rights	$ 1.60
2014 Equity Plan [Member] | Equity Option [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock option exercised	237,499
Stock option exercised, value	$ 241
Employee Stock Purchase Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Employee stock purchase plans	194,240