Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)

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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Recurring Payment $ 596 $ 146 $ 1,231 $ 146
Total 8,711 2,273 17,029 12,233
3D Printers        
Disaggregation of Revenue [Line Items]        
Revenue 7,281 1,738 13,594 11,038
Support services        
Disaggregation of Revenue [Line Items]        
Revenue $ 834 $ 389 $ 2,204 $ 1,049