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Description of Business and Summary of Significant Accounting Policies and Practices (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value of Cash and Cash Equivalents | The following table provides information about the fair value of our cash and cash equivalents balance (in thousands):
| Years ended December 31, |
| 2019 |  |  | 2020 |
Level 1 Assets: |  |  |  |  |  |  |
Cash | $ | 14,463 |  |  | $ | 13,492 |
Money market funds |  | 27,268 |  |  |  | 20,359 |
Total cash and cash equivalents | $ | 41,731 |  |  | $ | 33,851 |
Allowance for Doubtful Accounts and Advertiser Credit Activity | The allowance for doubtful accounts activity for the periods indicated is as follows (in thousands):
|  | Balance at beginning of period |  |  | Charged to costs and expenses |  |  | Write-offs, net of recoveries |  |  | Balance at end of period |
December 31, 2019 |  |  | 417 |  |  |  | 4 |  |  |  | 155 |  |  |  | 266 |
December 31, 2020 |  |  | 266 |  |  |  | 246 |  |  |  | 68 |  |  |  | 444 |
The allowance for advertiser credits activity for the periods indicated is as follows (in thousands):
|  | Balance at beginning of period |  |  | Additions charged against revenue |  |  | Credits processed and other |  |  | Balance at end of period |
December 31, 2019 |  |  | 543 |  |  |  | 242 |  |  |  | 632 |  |  |  | 153 |
December 31, 2020 |  |  | 153 |  |  |  | 1,029 |  |  |  | 520 |  |  |  | 662 |
Computation of Net Loss Per Share Basic and Diluted | The following table presents the computation of basic net loss per share for the periods ended (in thousands, except per share amounts):
|  | Years ended December 31, |
|  | 2019 |  |  | 2020 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Basic net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations, net of tax |  | $ | (1,026 | ) |  | $ | (8,706 | ) |  | $ | (4,233 | ) |  | $ | (37,785 | )
Discontinued operations, net of tax |  |  | 600 |  |  |  | 5,090 |  |  |  | 360 |  |  |  | 3,212 |
Net loss applicable to common stockholders |  | $ | (426 | ) |  | $ | (3,616 | ) |  | $ | (3,873 | ) |  | $ | (34,573 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net loss per share |  |  | 4,793 |  |  |  | 40,667 |  |  |  | 4,661 |  |  |  | 41,599 |
Basic net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations, net of tax |  | $ | (0.21 | ) |  | $ | (0.21 | ) |  | $ | (0.91 | ) |  | $ | (0.91 | )
Discontinued operations, net of tax |  |  | 0.12 |  |  |  | 0.12 |  |  |  | 0.08 |  |  |  | 0.08 |
Basic net loss per share applicable to common stockholders |  | $ | (0.09 | ) |  | $ | (0.09 | ) |  | $ | (0.83 | ) |  | $ | (0.83 | )
The following table presents the computation of diluted net loss per share for the periods ended (in thousands, except per share amounts):
|  | Years ended December 31, |
|  | 2019 |  |  | 2020 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Diluted net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations, net of tax |  | $ | (1,026 | ) |  | $ | (8,706 | ) |  | $ | (4,233 | ) |  | $ | (37,785 | )
Reallocation of net loss for Class A shares as a result of conversion of Class A to Class B shares |  |  | — |  |  |  | (1,026 | ) |  |  | — |  |  |  | (4,233 | )
Diluted net loss from continuing operations, net of tax |  | $ | (1,026 | ) |  | $ | (9,732 | ) |  | $ | (4,233 | ) |  | $ | (42,018 | )
Net income from discontinued operations, net of tax |  |  | 600 |  |  |  | 5,090 |  |  |  | 360 |  |  |  | 3,212 |
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B share |  |  | — |  |  |  | 600 |  |  |  | — |  |  |  | 360 |
Diluted net income from discontinued operations, net of tax |  | $ | 600 |  |  | $ | 5,690 |  |  | $ | 360 |  |  | $ | 3,572 |
Net loss applicable to common stockholders |  | $ | (426 | ) |  | $ | (4,042 | ) |  | $ | (3,873 | ) |  | $ | (38,446 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net loss per share |  |  | 4,793 |  |  |  | 40,667 |  |  |  | 4,661 |  |  |  | 41,599 |
Conversion of Class A to Class B common shares outstanding |  |  | — |  |  |  | 4,793 |  |  |  | — |  |  |  | 4,661 |
Weighted average number of shares outstanding used to calculate diluted net loss per share |  |  | 4,793 |  |  |  | 45,460 |  |  |  | 4,661 |  |  |  | 46,260 |
Diluted net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations, net of tax |  | $ | (0.21 | ) |  | $ | (0.21 | ) |  | $ | (0.91 | ) |  | $ | (0.91 | )
Discontinued operations, net of tax |  |  | 0.12 |  |  |  | 0.12 |  |  |  | 0.08 |  |  |  | 0.08 |
Diluted net loss per share applicable to common stockholders |  | $ | (0.09 | ) |  | $ | (0.09 | ) |  | $ | (0.83 | ) |  | $ | (0.83 | )
Accounts Receivable |
Schedules of Concentration of Risk, by Risk Factor | The Company has one customer that represents more than 10% of consolidated accounts receivable. The outstanding receivable balance for this customer is as follows (in percentages):
|  | At December 31, |
|  | 2019 |  |  | 2020 |
Customer A |  |  | 16 | % |  |  | 18 | %

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