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Allowance Accounts (Tables) | 12 Months Ended
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Dec. 31, 2022
Credit Loss [Abstract] |
Schedule of activities in allowance for credit losses and deferred tax assets | The following table sets forth the activity in our valuation accounts for each of the three years in the period ended December 31, 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Allowance for | ​ | Deferred Tax Asset
​ |  | Credit Losses |  | Valuation Allowance
Balance at December 31, 2019 | ​ | $ | — | ​ | $ | 18,631
Additions (reductions) (1) | ​ |  | 2,684 | ​ |  | —
Adjustments (2) | ​ |  | 785 | ​ |  | 1,091
Balance at December 31, 2020 | ​ | ​ | 3,469 | ​ | ​ | 19,722
Additions (reductions) (1) | ​ | ​ | (146) | ​ | ​ | —
Write-offs (3) | ​ | ​ | (1,846) | ​ | ​ | ​
Adjustments (4) | ​ | ​ | — | ​ | ​ | (5,675)
Balance at December 31, 2021 | ​ | ​ | 1,477 | ​ | ​ | 14,047
Additions (reductions) (1) | ​ |  | 800 | ​ |  | —
Adjustments (5) | ​ |  | — | ​ |  | 8,110
Balance at December 31, 2022 | ​ | $ | 2,277 | ​ | $ | 22,157
(1) | Additions (reductions) in allowance for credit losses reflect credit loss reserves (releases) during the respective years, including a $1.7 million credit loss reserve in 2020 related to a receivable in our Robotics segment. Additions during 2022 primarily reflected adjustments to the allowance for credit losses due to increases in our expected credit losses as a result of the Alliance acquisition.
(2) | The adjustment in allowance for credit losses reflects provision for current expected credit losses upon the adoption of ASU No. 2016-13 on January 1, 2020.
(3) | 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.
(4) | The decrease in valuation allowance primarily relates to the valuation allowance release for certain of our U.K. operations.
(5) | The increase in valuation allowance relates to current year activity and the related change in unrealizable net deferred tax assets.

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable and valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References No definition available. + Details
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- References No definition available. + Details
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