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Accounts Receivable, Net and Revenue Concentrations | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Accounts Receivable, Net and Revenue Concentrations | Accounts Receivable, Net and Revenue Concentrations Accounts receivable, net were as follows:
| December 31,
(In thousands) | 2017 |  | 2016
Trade receivables, gross | $ | 142,299 |  |  | $ | 120,965 |
Allowance for doubtful accounts | (1,064 | ) |  | (904 | )
Allowance for sales returns | (562 | ) |  | (539 | )
Net trade receivables | 140,673 |  |  | 119,522 |
Other | 10,905 |  |  | 5,070 |
Accounts receivable, net | $ | 151,578 |  |  | $ | 124,592 |
Allowance for Doubtful Accounts Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Year Ended December 31,
2017 |  | 2016 |  | 2015
Balance at beginning of period | $ | 904 |  |  | $ | 822 |  |  | $ | 616 |
Additions to costs and expenses | 166 |  |  | 183 |  |  | 299 |
(Write-offs)/Foreign exchange effects | (6 | ) |  | (101 | ) |  | (93 | )
Balance at end of period | $ | 1,064 |  |  | $ | 904 |  |  | $ | 822 |
Sales Returns The allowance for sales returns at December 31, 2017 and 2016 included reserves for items returned prior to year-end that were not completely processed, and therefore had not yet been removed from the allowance for sales returns balance. If these returns had been fully processed, the allowance for sales returns balance would have been approximately $0.4 million and $0.4 million on December 31, 2017 and 2016, respectively. The value of these returned goods was included in our inventory balance at December 31, 2017 and 2016. Significant Customers Net sales to the following customers totaled more than 10% of our net sales:
| Year Ended December 31, |
| 2017 |  | 2016 |  | 2015 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 159,829 |  |  | 23.0 | % |  | $ | 149,476 |  |  | 22.9 | % |  | $ | 129,475 |  |  | 21.5 | % |
AT&T | 77,888 |  |  | 11.2 |  |  | 74,704 |  |  | 11.5 |  |  | 80,820 |  |  | 13.4 |  |
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| December 31, |
| 2017 |  | 2016 |
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net |
Comcast Corporation | $ | 25,142 |  |  | 16.6 | % |  | $ | 23,716 |  |  | 19.0 | % |
AT&T | — |  | (1) | — |  | (1) | 14,108 |  |  | 11.3 |  |
(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at December 31, 2017.

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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