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BALANCE SHEET COMPONENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | $ 101,113 | $ 132,653 |  |
Restricted cash | 2,881 | 2,998 |  |
Cash, cash equivalents and restricted cash | 103,994 | 135,651 | $ 135,209 | $ 138,478
Inventories: |  |  |  |
Finished goods | 7,817 | 11,171 |  |
Raw materials | 1,104 | 1,145 |  |
Reserve for obsolescence | (922) | (151) |  |
Inventories, net | 7,999 | 12,165 |  |
Other accrued expenses: |  |  |  |
Sales returns | 290 | 801 |  |
Employee-related expense | 1,998 | 4,051 |  |
Warehousing, inventory-related and other | 1,104 | 1,269 |  |
Other accrued expenses | 3,392 | 6,121 |  |
Deferred revenue: |  |  |  |
Deferred revenue | 3,302 | 6,795 |  |
Unshipped product |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 1,171 | 4,574 |  |
Auto ship advances |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 1,983 | 1,876 |  |
Other |  |  |  |
Deferred revenue: |  |  |  |
Deferred revenue | 148 | 345 |  |
Cash |  |  |  |
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | 17,711 | 47,323 |  |
Cash equivalents |  |  |  |
Cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | $ 83,402 | $ 85,330 |  |

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