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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net sales from external customers: |  |  |  |  |
United States | $ | 3,348 |  |  | $ | 4,100 |  |  | $ | 3,246 |
Canada | 1,938 |  |  | 1,809 |  |  | 2,746 |
Peru | 508 |  |  | — |  |  | — |
Hong Kong 1 | 174,926 |  |  | 263,482 |  |  | 245,737 |
China | 7,282 |  |  | 9,086 |  |  | 4,425 |
Taiwan | 5,591 |  |  | 6,213 |  |  | 5,965 |
South Korea | 466 |  |  | 691 |  |  | 1,129 |
Russia, Kazakhstan and Ukraine 2 | 913 |  |  | 858 |  |  | 1,139 |
Europe | 2,278 |  |  | 1,234 |  |  | 382 |
Other foreign countries | 313 |  |  | 255 |  |  | 91 |
Total net sales | $ | 197,563 |  |  | $ | 287,728 |  |  | $ | 264,860 |
Schedule of Segment Reporting Information, by Segment |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net sales by product and service: |  |  |  |  |
Product sales | $ | 187,591 |  |  | $ | 269,731 |  |  | $ | 253,041 |
Enrollment package revenue, freight and other | 13,676 |  |  | 25,616 |  |  | 17,623 |
Less: sales returns | (3,704 | ) |  | (7,619 | ) |  | (5,804 | )
Total net sales | $ | 197,563 |  |  | $ | 287,728 |  |  | $ | 264,860 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country |
| December 31,
| 2017 |  | 2016
Long-lived assets: |  |  |
United States | $ | 648 |  |  | $ | 763 |
Hong Kong | 78 |  |  | 140 |
China | 112 |  |  | 199 |
Other foreign countries | 311 |  |  | 286 |
Total long-lived assets | $ | 1,149 |  |  | $ | 1,388 |

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- Definition Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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