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OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2020 |  | 2019 |  | 2020
Beginning balance | $ | 572 |  |  | $ | 1,020 |  |  | $ | 169 |  |  | $ | 255 |
Bad debt expense (reversal) | 414 |  |  | (45) |  |  | 1,066 |  |  | 1,281 |
Write-offs, net of recoveries | (537) |  |  | 15 |  |  | (786) |  |  | (546) |
Ending balance | $ | 449 |  |  | $ | 990 |  |  | $ | 449 |  |  | $ | 990 |

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