Allowance Accounts (Tables)

12 Months Ended

Dec. 31, 2021

Credit Loss [Abstract]

Schedule of activities in allowance for credit losses

The following table sets forth the activity in our valuation accounts for each of the three years in the period ended December 31, 2021 (in thousands):

	Allowance for		Deferred Tax Asset
	Credit Losses		Valuation Allowance
Balance at December 31, 2018	$	—	$	17,940
Adjustments		—		691
Balance at December 31, 2019		—		18,631
Additions (1)		2,684		—
Adjustments (2)		785		1,091
Balance at December 31, 2020		3,469		19,722
Reductions (1)		(146)		—
Write-offs (3)		(1,846)		—
Adjustments (4)		—		(5,675)
Balance at December 31, 2021	$	1,477	$	14,047

(1) Additions (reductions) in allowance for credit losses reflect credit loss reserves during the respective years, including a $1.7 million credit loss reserve in 2020 related to a receivable in our Robotics segment.

(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.