| Schedule of Additional Balance Sheet Components |
The components of certain balance sheet amounts are as follows (in thousands): | | | | | | | | | | December 31, | | 2016 | | 2015 | Property and equipment: | | | | Office equipment | $ | 517 |
| | $ | 495 |
| Office software | 672 |
| | 536 |
| Machinery | 28 |
| | 24 |
| Furniture and fixtures | 241 |
| | 222 |
| Leasehold improvements | 840 |
| | 730 |
| Construction in progress (including internal use software development costs) | 157 |
| | 10 |
| Property and equipment, at cost | 2,455 |
| | 2,017 |
| Accumulated depreciation and amortization | (1,067 | ) | | (1,123 | ) | | $ | 1,388 |
| | $ | 894 |
| Other accrued expenses: | | | | Sales returns | $ | 1,632 |
| | $ | 1,552 |
| Employee-related expense | 10,541 |
| | 11,064 |
| Warehousing, inventory-related and other | 2,816 |
| | 4,087 |
| | $ | 14,989 |
| | $ | 16,703 |
| Deferred revenue: | |
| | |
| Unshipped product | $ | 2,191 |
| | $ | 1,783 |
| Auto ship advances | 2,327 |
| | 1,597 |
| Enrollment package revenue | 430 |
| | 331 |
| Market development fees | — |
| | 300 |
| | $ | 4,948 |
| | $ | 4,011 |
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