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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of reconciliation of the allowance for doubtful accounts | A reconciliation of the beginning and ending balances of the allowance for doubtful accounts is as follows (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Balance, beginning of the period | $ | 1,466 |  |  | $ | 1,143 |  |  | $ | 675 |
Charges to earnings | 1,785 |  |  | 1,697 |  |  | 880 |
Write-off of uncollectible accounts receivable | (1,859) |  |  | (1,400) |  |  | (435) |
Recoveries collected | 10 |  |  | 26 |  |  | 23 |
Balance, end of the period | $ | 1,402 |  |  | $ | 1,466 |  |  | $ | 1,143 |
Schedule of depreciation period for each asset category | The following table presents the estimated useful lives for each asset category:
Asset Category | Estimated Useful Lives
Computer equipment and capitalized software | 1 to 5 years
Leasehold improvements | Lesser of asset life or life of lease
Furniture and other equipment | 7 years
Aircraft and automobile | 5 to 10 years
Schedule of effect of new accounting pronouncements | The cumulative effect of the changes made to the consolidated January 1, 2018 balance sheet for the adoption of ASC Topic 606 were as follows (in thousands):
| December 31, 2017 | Adjustments due to ASC Topic 606 | January 1, 2018
Assets: |  |  |
Prepaid and other current assets | $ | 11,881 |  | $ | 1,903 |  | $ | 13,784 |
Deferred income tax assets | 20,156 |  | (530) |  | 19,626 |
Shareholders' equity: |  |  |
Accumulated deficit | $ | (708,354) |  | $ | 1,373 |  | $ | (706,981) |

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