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Nature of Business and Basis of Presentation, Nature of Business, Going Concern, Accounts Receivable and Inventories (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 19, 2021
USD ($)
Jun. 30, 2021
USD ($)
Customer
Jun. 30, 2020
Customer
Jun. 30, 2021
USD ($)
Customer
Jun. 30, 2020
Customer
Dec. 31, 2020
USD ($)
Customer
Going Concern [Abstract]            
Accumulated deficit   $ (243,290)   $ (243,290)   $ (233,338)
Net proceeds from issuance of convertible preferred stock $ 57,600          
Accounts Receivable [Abstract]            
Accounts receivables maximum credit period from invoice date       30 days    
Allowance for doubtful accounts   0   $ 0   0
Inventories [Abstract]            
Finished Goods   1,304   1,304   1,343
Work in Process   199   199   342
Raw Materials   1,153   1,153   1,272
Total   $ 2,656   $ 2,656   $ 2,957
Accounts Receivable [Member]            
Revenue, Performance Obligation [Abstract]            
Number of major customers | Customer       1   0
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]            
Revenue, Performance Obligation [Abstract]            
Percentage of net sales       12.00%    
ASC 606 [Member] | Net Sales [Member]            
Revenue, Performance Obligation [Abstract]            
Number of major customers | Customer   0 1 2 2  
ASC 606 [Member] | Customer One [Member] | Net Sales [Member] | Customer Concentration Risk [Member]            
Revenue, Performance Obligation [Abstract]            
Percentage of net sales     10.00%      
ASC 606 [Member] | Customer Two [Member] | Net Sales [Member] | Customer Concentration Risk [Member]            
Revenue, Performance Obligation [Abstract]            
Percentage of net sales       11.00% 10.00%