11. Commitments (Tables)  | 
3 Months Ended | |||||||||||||||||||||||||||||||||||
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Mar. 31, 2021  | ||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||
| Cash flow information regarding leases | 
 Supplemental cash flow information and non-cash activity related to our operating leases are as follows: 
 
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| Supplemental information related to operating leases | 
 Supplemental balance sheet information related to our operating leases are as follows: 
 
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