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Commitments and Contingencies - Contingencies (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Apr. 20, 2021
item
Dec. 31, 2020
USD ($)
Commitments and Contingencies      
Sales tax expense reversed $ 465,000    
Sales tax liability 1,228,000   $ 1,696,000
Pending Litigation      
Commitments and Contingencies      
Sales tax liability 1,228,000   $ 1,696,000
Smart Packaging Solutions SA v. CPI Card Group, Inc. | Pending Litigation      
Commitments and Contingencies      
The number of patents involved in lawsuit | item   4  
Loss contingency accrual $ 0