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Balance Sheet Components | 9 Months Ended
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Sep. 30, 2015
Property, Plant and Equipment [Abstract] |
Balance Sheets and Statement of Operations Components | Balance Sheets and Statements of Operations Components Inventory Components of inventory as of September 30, 2015 and December 31, 2014 are shown below (in thousands):
| September 30, 2015 |  | December 31, 2014
Raw materials | $ | 8,731 |  |  | $ | 9,922 |
Finished goods | 8,835 |  |  | 10,779 |
Total inventory | $ | 17,566 |  |  | $ | 20,701 |
Property and Equipment, Net Components of property and equipment, net as of September 30, 2015 and December 31, 2014 are shown below (in thousands):
| September 30, 2015 |  | December 31, 2014
Equipment | $ | 34,512 |  |  | $ | 30,486 |
Software | 3,518 |  |  | 3,197 |
Furniture and fixtures | 862 |  |  | 860 |
Leasehold improvements | 2,295 |  |  | 1,780 |
Construction in progress | 163 |  |  | 201 |
Property and equipment, gross | 41,350 |  |  | 36,524 |
Less: accumulated depreciation and amortization | (32,263 | ) |  | (25,744 | )
Total property and equipment, net | $ | 9,087 |  |  | $ | 10,780 |
Depreciation and amortization on our property and equipment for the three months ended September 30, 2015 and 2014 was $2.1 million and $2.6 million. Depreciation and amortization on our property and equipment for the nine months ended September 30, 2015 and 2014 was $6.7 million and $7.2 million. Deferred Revenue Deferred revenue as of September 30, 2015 and December 31, 2014 consists of the following (in thousands):
| September 30, 2015 |  | December 31, 2014
Deferred revenue: |  |  |
Products | $ | 3,169 |  |  | $ | 2,379 |
Services | 63,169 |  |  | 54,841 |
Total deferred revenue | 66,338 |  |  | 57,220 |
Less: current portion | (44,352 | ) |  | (39,256 | )
Non-current portion | $ | 21,986 |  |  | $ | 17,964 |
Accrued Liabilities Accrued liabilities as of September 30, 2015 and December 31, 2014 consists of the following (in thousands):
| September 30, 2015 |  | December 31, 2014
Accrued compensation and benefits | $ | 14,459 |  |  | $ | 14,447 |
Accrued tax liabilities | 2,753 |  |  | 2,554 |
Other | 3,748 |  |  | 5,434 |
Total accrued liabilities | $ | 20,960 |  |  | $ | 22,435 |

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