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BALANCE SHEET COMPONENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | $ 132,206 | $ 135,311 |  |
Restricted cash | 3,003 | 3,167 |  |
Cash, cash equivalents and restricted cash | 135,209 | 138,478 | $ 130,045 | $ 128,884
Inventories: |  |  |  |
Finished goods | 10,826 | 7,779 |  |
Raw materials | 370 | 799 |  |
Reserve for obsolescence | (77) | (180) |  |
Inventories, net | 11,119 | 8,398 |  |
Other accrued expenses: |  |  |  |
Sales returns | 437 | 614 |  |
Employee-related expense | 5,802 | 5,568 |  |
Warehousing, inventory-related and other | 1,102 | 1,423 |  |
Other accrued expenses | 7,341 | 7,605 |  |
Deferred revenue: |  |  |  |
Deferred revenue | 4,462 | 4,455 |  |
Unshipped product |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 2,307 | 2,411 |  |
Auto ship advances |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 1,801 | 1,665 |  |
Other |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 354 | 379 |  |
Cash |  |  |  |
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | 54,709 | 61,703 |  |
Cash equivalents |  |  |  |
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | $ 77,497 | $ 73,608 |  |

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