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Credit Losses (Tables) | 12 Months Ended
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Dec. 31, 2020
Credit Loss [Abstract] |
Summary of Allowance for Credit Losses Related to Accounts Receivable and Changes | The allowance for credit losses related to accounts receivable as of December 31, 2020, and changes for the quarters ended March 31, June 30, September 30 and December 31, 2020 are as follows (in thousands):
Balance at December 31, 2019 |  | $ | 6,516 |
Provision for expected credit losses |  |  | 1,055 |
Balance at March 31, 2020 |  |  | 7,571 |
Provision for expected credit losses |  |  | 4,551 |
Balance at June 30, 2020 |  |  | 12,122 |
Write-offs |  |  | (1,126 | )
Balance at September 30, 2020 |  |  | 10,996 |
Write-offs |  |  | (154 | )
Balance at December 31, 2020 |  | $ | 10,842 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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