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Accounts Receivable, Net and Revenue Concentrations | 9 Months Ended
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Sep. 30, 2019
Receivables [Abstract] |
Accounts Receivable, Net and Revenue Concentrations | Accounts Receivable, Net and Revenue Concentrations Accounts receivable, net were as follows:
(In thousands) | September 30, 2019 |  | December 31, 2018
Trade receivables, gross | $ | 151,220 |  |  | $ | 133,774 |
Allowance for doubtful accounts | (1,292 | ) |  | (1,121 | )
Allowance for sales returns | (497 | ) |  | (731 | )
Net trade receivables | 149,431 |  |  | 131,922 |
Other | 7,707 |  |  | 12,767 |
Accounts receivable, net | $ | 157,138 |  |  | $ | 144,689 |
Allowance for Doubtful Accounts Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Nine Months Ended September 30,
2019 |  | 2018
Balance at beginning of period | $ | 1,121 |  |  | $ | 1,064 |
Additions to costs and expenses | 275 |  |  | 2 |
(Write-offs)/Foreign exchange effects | (104 | ) |  | (74 | )
Balance at end of period | $ | 1,292 |  |  | $ | 992 |
Significant Customers Net sales to the following customers totaled more than 10% of our net sales:
| Three Months Ended September 30, |
| 2019 |  | 2018 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 30,419 |  |  | 15.2 | % |  | $ | 32,336 |  |  | 17.7 | % |
Ring L.L.C. | $ | 21,050 |  |  | 10.5 | % |  | — |  | (1) | — |  | (1)
| Nine Months Ended September 30, |
| 2019 |  | 2018 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 91,058 |  |  | 15.7 | % |  | $ | 99,853 |  |  | 19.6 | % |
(1) Net sales to this customer did not total more than 10% of our total net sales in the prior period. There were no customers with an accounts receivable balance in excess of 10% of the total accounts receivable balance as of September 30, 2019. Revenue Recognition Pattern The pattern of revenue recognition was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Goods and services transferred at a point in time | $ | 108,065 |  |  | $ | 97,952 |  |  | $ | 309,841 |  |  | $ | 275,552 |
Goods and services transferred over time | 92,659 |  |  | 84,765 |  |  | 268,942 |  |  | 234,386 |
Net sales | $ | 200,724 |  |  | $ | 182,717 |  |  | $ | 578,783 |  |  | $ | 509,938 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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