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Accounts Receivable and Contract Assets | 6 Months Ended
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Jun. 30, 2021
Accounts Receivable and Contract Assets [Abstract] |
Accounts Receivable and Contract Assets | 2. Accounts Receivable and Contract Assets Accounts receivable and contract assets are summarized in the following table:
|  | As of Jun. 30, 2021 |  |  | As of Dec. 31, 2020 |  |  | Change |
Accounts receivable – customers |  | $ | 4,782 |  |  | $ | 5,633 |  |  | $ | (851 | )
Other receivables |  |  | 216 |  |  |  | 206 |  |  |  | 10 |
|  |  | 4,998 |  |  |  | 5,839 |  |  |  | (841 | )
Less: allowance for doubtful accounts |  |  | (792 | ) |  |  | (655 | ) |  |  | (137 | )
Accounts receivable, net |  | $ | 4,206 |  |  | $ | 5,184 |  |  | $ | (978 | )
Unbilled revenue |  | $ | 3,179 |  |  | $ | 2,847 |  |  | $ | 332 |
Differences in timing of revenue recognition, billings, and cash collections result in receivables and contract assets. Generally, billing occurs subsequent to revenue recognition, resulting in a contract asset reported as unbilled revenue on the balance sheet. The Company does not receive advances or deposits from customers before revenue is recognized so no contract liabilities are reported. Accounts receivable are recorded when the right to consideration becomes unconditional and are presented separately on the balance sheet. The changes in accounts receivable – customers and in unbilled revenue were primarily due to normal timing difference between performance and the customer’s payments.

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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