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OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION (Tables) | 6 Months Ended
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Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Changes in Allowance for Doubtful Accounts | The following table summarizes changes in the allowance for doubtful accounts (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2020 |  | 2019 |  | 2020
Beginning balance | $ | 397 |  |  | $ | 1,383 |  |  | $ | 169 |  |  | $ | 255 |
Bad debt expense (reversal) | 402 |  |  | (151 | ) |  | 652 |  |  | 1,326 |
Write-offs, net of recoveries | (227 | ) |  | (212 | ) |  | (249 | ) |  | (561 | )
Ending balance | $ | 572 |  |  | $ | 1,020 |  |  | $ | 572 |  |  | $ | 1,020 |

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