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Balance Sheet Components | 6 Months Ended
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Jun. 30, 2016
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 June 30, 2016 and December 31, 2015 are shown below (in thousands):
| June 30, 2016 |  | December 31, 2015
Raw materials | $ | 6,340 |  |  | $ | 9,418 |
Finished goods | 7,993 |  |  | 8,873 |
Total inventory | $ | 14,333 |  |  | $ | 18,291 |
Property and Equipment, net Components of property and equipment, net as of June 30, 2016 and December 31, 2015 are shown below (in thousands):
| June 30, 2016 |  | December 31, 2015
Equipment | $ | 39,128 |  |  | $ | 35,836 |
Software | 3,801 |  |  | 3,548 |
Furniture and fixtures | 857 |  |  | 864 |
Leasehold improvements | 2,536 |  |  | 2,492 |
Construction in progress | 9 |  |  | 83 |
Property and equipment, gross | 46,331 |  |  | 42,823 |
Less: accumulated depreciation and amortization | (37,414 | ) |  | (33,920 | )
Total property and equipment, net | $ | 8,917 |  |  | $ | 8,903 |
Depreciation and amortization on our property and equipment for the three months ended June 30, 2016 and 2015 was $1.8 million and $2.2 million. Depreciation and amortization on our property and equipment for the six months ended June 30, 2016 and 2015 was $3.7 million and $4.7 million. Goodwill and Intangible Assets Activity related to goodwill for the six months ended June 30, 2016 and 2015 is as follows (in thousands):
| June 30, 2016 |  | December 31, 2015
Balance at beginning of period | $ | 72 |  |  | $ | 72 |
Acquisitions | 1,235 |  |  | — |
Total goodwill | $ | 1,307 |  |  | $ | 72 |
Purchased intangible assets, net consisted of the following (in thousands):
| June 30, 2016 |  | December 31, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Developed technology | $ | 5,050 |  |  | $ | — |  |  | $ | 5,050 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Customer relationships | 1,746 |  |  | (1,746 | ) |  | — |  |  | 1,746 |  |  | (1,746 | ) |  | — |
Patent | 1,436 |  |  | (707 | ) |  | $ | 729 |  |  | 1,436 |  |  | (641 | ) |  | 795 |
Total | $ | 8,232 |  |  | $ | (2,453 | ) |  | $ | 5,779 |  |  | $ | 3,182 |  |  | $ | (2,387 | ) |  | $ | 795 |
Total future amortization expense for purchased intangible assets that have finite lives, based on our existing intangible assets and their current estimated useful lives as of June 30, 2016, is as follows (in thousands):
Fiscal Years Ending December 31, |  |
Remainder of 2016 |  | $ | 571 |
2017 |  | 1,143 |
2018 |  | 1,143 |
2019 |  | 1,143 |
2020 |  | 1,143 |
Thereafter |  | 636 |
Total |  | $ | 5,779 |
Accrued Liabilities Accrued liabilities as of June 30, 2016 and December 31, 2015 consists of the following (in thousands):
| June 30, 2016 |  | December 31, 2015
Accrued compensation and benefits | $ | 19,808 |  |  | $ | 18,134 |
Accrued tax liabilities | 2,062 |  |  | 4,520 |
Other | 6,960 |  |  | 5,103 |
Total accrued liabilities | $ | 28,830 |  |  | $ | 27,757 |
Deferred Revenue Deferred revenue as of June 30, 2016 and December 31, 2015 consists of the following (in thousands):
| June 30, 2016 |  | December 31, 2015
Deferred revenue: |  |  |
Products | $ | 2,699 |  |  | $ | 3,233 |
Services | 73,064 |  |  | 69,571 |
Total deferred revenue | 75,763 |  |  | 72,804 |
Less: current portion | (51,384 | ) |  | (49,572 | )
Non-current portion | $ | 24,379 |  |  | $ | 23,232 |

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