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Accounts Receivable and Revenue Concentration
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts Receivable and Revenue Concentration Accounts Receivable and Revenue Concentration
The following table is a summary of concentration of credit risk by customer revenue as a percentage of our total revenue:

Year Ended December 31,
Percentage of Revenue20212020
Customer A44.3 %18.1 %
Customer B28.8 57.9 
Customer C12.4 7.7 
Customer D 5.2 10.4 
Remaining Customers9.3 5.9 
     Total100.0 %100.0 %

The following table is a summary of concentration of credit risk by customer accounts receivables as a percentage of our total accounts receivable:

At December 31,
Percentage of Accounts Receivable20212020
Customer B 94.0 %13.5 %
Customer A— 85.9 
Remaining customers6.0 0.6 
    Total100.0 %100.0 %

The Company applies the specific identification method for assessing provision for doubtful accounts. There was no bad debt expense in each of the year ended December 31, 2021 and 2020.
On February 26, 2021, the Company received a termination notice from Customer B and working with this customer on a transition plan, we completed the participation of this customer's members in the program as of December 31, 2021. As a result of this termination notice, the Company’s management assessed various options and deemed it prudent to initiate a workforce reduction plan to effectively align its resources and manage its operating costs, resulting in reduction of 35% of full time positions. In addition, on August 18, 2021, the Company received a termination notice from Customer A of their intent not to continue the program past December 31, 2021. All members relating to Customer A have completed their participation in the program as of December 31, 2021. See Note 6 below for more information relating to restructuring, including reduction in workforce.

In September 2021, the Company agreed to a contract modification with a current customer to credit certain fees in order to align with the customer's program spend, which was recorded as a cumulative adjustment, and was not considered to be significant for the year ended December 31, 2021.