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Revenue and Accounts Receivable, Net (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Pattern of Revenue Recognition
The pattern of revenue recognition was as follows:
Year Ended December 31,
(In thousands)202020192018
Goods and services transferred at a point in time$495,033 $558,361 $577,085 
Goods and services transferred over time119,647 195,116 103,156 
Net sales$614,680 $753,477 $680,241 
Revenue from External Customers by Geographic Areas
Our net sales to external customers by geographic area were as follows: 
Year Ended December 31,
(In thousands)202020192018
United States$255,651 $407,291 $315,214 
Asia (excluding the PRC)117,142 104,324 124,657 
Europe108,185 94,491 85,228 
People's Republic of China88,246 83,677 91,446 
Latin America17,481 30,006 30,954 
Other27,975 33,688 32,742 
Total net sales$614,680 $753,477 $680,241 
Net Sales to Significant Customers
Net sales to the following customer totaled more than 10% of our net sales: 
 Year Ended December 31,
 202020192018
 $ (thousands)% of Net
Sales
$ (thousands)% of Net
Sales
$ (thousands)% of Net
Sales
Comcast Corporation$123,574 20.1 %$119,561 15.9 %$119,809 17.6 %
Accounts Receivable, Net and Changes in the Allowance for Credit Losses
Accounts receivable, net were as follows:
December 31,
(In thousands)20202019
Trade receivables, gross$122,828 $130,888 
Allowance for credit losses(1,412)(1,492)
Allowance for sales returns(761)(623)
Trade receivables. net120,655 128,773 
Other8,778 10,425 
Accounts receivable, net$129,433 $139,198 

Allowance for Credit Losses

Changes in the allowance for credit losses were as follows:
(In thousands)Year Ended December 31,
202020192018
Balance at beginning of period$1,492 $1,121 $1,064 
Additions to costs and expenses332 441 305 
Cash receipts(157)— — 
Write-offs/Foreign exchange effects(255)(70)(248)
Balance at end of period$1,412 $1,492 $1,121 
Trade Receivables Associated with Significant Customers
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
December 31,
20202019
$ (thousands)% of Accounts Receivable, Net$ (thousands)% of Accounts Receivable, Net
Comcast Corporation$19,782 15.3 %$— 
(1)
— %
(1)
Dish Network Corporation$— 
(1)
— %
(1)
$14,677 10.5 %

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