Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)

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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Statement of Cash Flows [Abstract]    
Net transfers of reusable components from loaned systems $ 30 $ 40
Reduction of additional paid-in capital 3,100  
Conversion of debt 7,500  
Accrued interest included in the conversion of debt $ 40  
Shares issued upon conversion of debt 1,256,143  
Amortization of debt discount $ 200