Segment Information - The Company's Net Sales by Product and Service (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| 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 |
| X | ||||||||||
- Definition The aggregate refunds recognized during an accounting period due to goods returned by customers (other than under warranty provisions). Returns are a deduction from gross revenue in arriving at net revenue. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Fees charged to customers for the delivery, generally by postal or freight service providers, of product or goods purchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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