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Accounts Receivable and Revenue Concentration
 3 Months Ended
Mar. 31, 2022
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 revenues as a percentage of our total revenue:

Three Months Ended
March 31,
Percentage of Revenue20222021
Customer A48.3 %7.0 %
Customer B24.0 4.0 
Customer C18.5 2.2 
Customer D 4.4 45.8 
Customer E — 38.4 
Remaining customers4.8 2.6 
100.0 %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:

Percentage of Accounts Receivable
March 31, 2022
December 31, 2021
Customer D (1)85.0 %94.0 %
Customer A14.1 — 
Remaining customers0.9 6.0 
100.0 %100.0 %
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(1) Approximately 95% of the outstanding accounts receivable balance for this customer at March 31, 2022 has been received as of the date of this Form 10-Q. We continue to expect full payment of the remaining uncollected portion.


The Company applies the specific identification method for assessing provision for doubtful accounts. There was no bad debt expense in each of the three months ended March 31, 2022 and 2021.
On February 26, 2021, the Company received a termination notice from Customer D 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. In addition, on August 18, 2021, the Company received a termination notice from Customer E of their intent not to continue the program past December 31, 2021. All members relating to Customers D and E have completed their participation in the program as of December 31, 2021. As a result of these termination notices, in March and November 2021, the Company’s management assessed various options and deemed it prudent to initiate workforce reduction plans to effectively align its resources and manage its operating costs. As of December 31, 2021, $0.4 million of accrued termination related costs related to these workforce reduction plans remained outstanding as part of "Other accrued liabilities" on our condensed consolidated balance sheet. As of March 31, 2022, there was no amount outstanding relating to such accrued termination related costs.