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Discontinued operations (Tables)
 12 Months Ended
Dec. 31, 2021
Discontinued Operations [Abstract]  
Summary of discontinued operations
Net income (loss) from discontinued operations for the years ended December 31, 2021 and 2020 is comprised of the following:

20212020
Product and service revenues$— $262 
Cost of product and service revenues— 223 
Gross margin$— $39 
Total operating income (expenses)164 (2,115)
Finance income and other— — 
Gain (loss) on sale of assets— 168 
Net income (loss) from discontinued operations$164 $(1,908)

Net cash flows from discontinued operations for the years ended December 31, 2021 and 2020 is as follows:

20212020
Cash used in operating activities$(113)$(1,607)
Cash provided by investing activities— 957 
Cash used in financing activities— (20)
Cash used in discontinued operations$(113)$(670)