| Schedule of Additional Balance Sheet Components [Table Text Block] |
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December 31, |
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2017 |
|
2016 |
Cash and cash equivalents: |
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Cash |
$ |
61,703 |
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$ |
52,453 |
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Cash equivalents |
73,608 |
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|
73,468 |
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$ |
135,311 |
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$ |
125,921 |
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Inventories: |
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Finished goods |
$ |
7,779 |
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$ |
10,722 |
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Raw materials |
799 |
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|
617 |
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Inventory reserve for obsolescence |
(180 |
) |
|
(82 |
) |
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$ |
8,398 |
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$ |
11,257 |
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Property and equipment: |
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Office equipment |
$ |
530 |
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$ |
517 |
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Office software |
916 |
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|
672 |
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Machinery |
30 |
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|
28 |
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Furniture and fixtures |
276 |
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|
241 |
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Leasehold improvements |
957 |
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|
840 |
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Construction in progress (including internal-use software development costs) |
10 |
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|
157 |
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Property and equipment, at cost |
2,719 |
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|
2,455 |
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Accumulated depreciation and amortization |
(1,570 |
) |
|
(1,067 |
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$ |
1,149 |
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$ |
1,388 |
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Other accrued expenses: |
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Sales returns |
$ |
614 |
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$ |
1,632 |
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Employee-related expense |
5,568 |
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10,541 |
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Warehousing, inventory-related and other |
1,423 |
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|
2,816 |
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$ |
7,605 |
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$ |
14,989 |
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Deferred revenue: |
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Unshipped product |
$ |
2,411 |
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$ |
2,191 |
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Auto ship advances |
1,665 |
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|
2,327 |
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Enrollment package revenue |
379 |
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|
430 |
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$ |
4,455 |
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$ |
4,948 |
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