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Allowance For Credit Losses (Tables) | 3 Months Ended
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Mar. 31, 2022
Credit Loss [Abstract] |
Schedule of activities in allowance for credit losses | The following table sets forth the activity in our allowance for credit losses (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Balance at January 1, | ​ | $ | 1,477 | ​ | $ | 3,469
Additions (reductions) (1) | ​ |  | (126) | ​ |  | 7
Write-offs (2) | ​ | ​ | — | ​ | ​ | (1,811)
Balance at March 31, | ​ | $ | 1,351 | ​ | $ | 1,665
(1) | Additions (reductions) in allowance for credit losses reflect credit loss reserves (releases) during the respective periods.
(2) | The write-offs of allowance for credit losses reflect certain receivables related to our Robotics segment that were previously reserved and subsequently deemed to be uncollectible.

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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=124255953&loc=SL82919249-210447 + Details
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- References No definition available. + Details
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