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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Allowance for credit loss rollfoward | The following table summarizes the changes in the allowance for losses and sales adjustments:
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Balance at beginning of year | $ | 5,738 |  |  | $ | 4,647 |  |  | $ | 5,427 |
Provisions for losses and sales adjustments - accounts receivable | 3,517 |  |  | 1,636 |  |  | (569) |
Collections of accounts previously written off | — |  |  | (545) |  |  | (211) |
Balance at end of year | $ | 9,255 |  |  | $ | 5,738 |  |  | $ | 4,647 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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