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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Revenue $ 25,987 $ 23,851 $ 7,296
Costs of goods sold 28,557 35,127 9,280
Gross margin (2,570) (11,276) (1,984)
Operating expenses:      
Research and development 11,335 11,082 12,213
Selling and supply chain 15,382 20,537 24,138
Management fees 45 252 1,338
Restructuring costs 0 685 0
Total operating expenses 26,762 32,556 37,689
Loss from operations (29,332) (43,832) (39,673)
Gain upon extinguishment of Payroll Protection Program Loan 1,528 0 0
Interest, net (1,414) (878) 110
Non-operating expenses 19 (126) (49)
Loss before income taxes (29,199) (44,836) (39,612)
Income taxes 0 0 0
Net loss $ (29,199) $ (44,836) $ (39,612)
Basic and diluted net loss per share $ (0.78) $ (1.32) $ (1.21)
Weighted average shares outstanding - basic and diluted 37,475,763 33,882,406 32,805,684
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6,001,405 5,522,418 5,606,552