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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Product sales $ 0 $ 90,000 $ 0 $ 108,000
Operating cost and expense        
Cost of product sales 1,670,000 1,635,000 5,417,000 4,395,000
Research and development cost 273,000 210,000 738,000 669,000
General and administrative expense 2,681,000 1,656,000 7,109,000 6,286,000
Total operating expense 4,624,000 3,501,000 13,264,000 11,350,000
Loss from operations (4,624,000) (3,411,000) (13,264,000) (11,242,000)
Other income and (expense)        
Insurance proceeds net of related expenses 4,344,000 1,722,000 4,792,000 1,467,000
PPP loan forgiveness 0 0 332,000 0
Loss on disposal of property and equipment (1,411,000) 0 (5,665,000) 0
Interest expense (5,000) (166,000) (15,000) (513,000)
Interest and other income 310,000 18,000 334,000 43,000
Total other income (expense), net 3,238,000 1,574,000 (222,000) 997,000
Loss before income tax expense (1,386,000) (1,837,000) (13,486,000) (10,245,000)
Income tax expense 0 0 (2,000) (2,000)
Net loss $ (1,386,000) $ (1,837,000) $ (13,488,000) $ (10,247,000)
Weighted average shares outstanding, basic and diluted (in shares) 69,609,070 60,998,971 68,223,115 60,242,093
Basic and diluted net loss per share (in dollars per share) $ (0.02) $ (0.03) $ (0.20) $ (0.17)