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Revenue and Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Revenue and Accounts Receivable, Net Revenue and Accounts Receivable, Net
Revenue Details

The pattern of revenue recognition was as follows:
Year Ended December 31,
(In thousands)202120202019
Goods and services transferred at a point in time$498,554 $495,033 $558,361 
Goods and services transferred over time103,048 119,647 195,116 
Net sales$601,602 $614,680 $753,477 
Our net sales to external customers by geographic area were as follows: 
Year Ended December 31,
(In thousands)202120202019
United States$200,136 $255,651 $407,291 
Asia (excluding the PRC)127,140 117,142 104,324 
Europe126,551 108,185 94,491 
People's Republic of China87,866 88,246 83,677 
Latin America25,943 17,481 30,006 
Other33,966 27,975 33,688 
Total net sales$601,602 $614,680 $753,477 

Specific identification of the customer billing location was the basis used for attributing revenues from external customers to geographic areas.

Net sales to the following customer totaled more than 10% of our net sales: 
 Year Ended December 31,
 202120202019
 $ (thousands)% of Net
Sales		$ (thousands)% of Net
Sales		$ (thousands)% of Net
Sales
Comcast Corporation$98,361 16.3 %$123,574 20.1 %$119,561 15.9 %
Daikin Industries Ltd.$70,793 11.8 %$— 
(1)
— %
(1)
$— 
(1)
— %
(1)

(1) Sales associated with this customer did not total more than 10% of our net sales for the indicated period.

Accounts Receivable, Net

Accounts receivable, net were as follows:
December 31,
(In thousands)20212020
Trade receivables, gross$122,508 $122,828 
Allowance for credit losses(1,285)(1,412)
Allowance for sales returns(592)(761)
Trade receivables, net120,631 120,655 
Other (1)
8,584 8,778 
Accounts receivable, net$129,215 $129,433 

(1) Other accounts receivable is primarily comprised of value added tax and supplier rebate receivables.
Allowance for Credit Losses

Changes in the allowance for credit losses were as follows:
(In thousands)Year Ended December 31,
202120202019
Balance at beginning of period$1,412 $1,492 $1,121 
Additions to costs and expenses— 332 441 
Cash receipts— (157)— 
Write-offs/Foreign exchange effects(127)(255)(70)
Balance at end of period$1,285 $1,412 $1,492 

Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
December 31,
20212020
$ (thousands)% of Accounts Receivable, Net$ (thousands)% of Accounts Receivable, Net
Comcast Corporation$— 
(1)
— %
(1)
$19,782 15.3 %

(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net for the indicated period.