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Condensed Consolidated Financial Statement Details | 3 Months Ended
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Mar. 31, 2017
Property, Plant and Equipment [Abstract] |
Condensed Consolidated Financial Statement Details | Condensed Consolidated Financial Statement Details Inventory
| March 31, 2017 |  | December 31, 2016
| (in thousands)
Raw materials | $ | 7,379 |  |  | $ | 6,669 |
Finished goods | 9,130 |  |  | 8,401 |
Total inventory | $ | 16,509 |  |  | $ | 15,070 |
Property and Equipment, net
| Useful Life |  | March 31, 2017 |  | December 31, 2016
| (in years) |  | (in thousands)
Equipment | 1-3 |  | $ | 43,530 |  |  | $ | 41,815 |
Software | 1-3 |  | 3,816 |  |  | 3,801 |
Furniture and fixtures | 1-3 |  | 865 |  |  | 865 |
Leasehold improvements | 2-8 |  | 2,724 |  |  | 2,724 |
Construction in progress |  |  | — |  |  | 258 |
Property and equipment, gross |  |  | 50,935 |  |  | 49,463 |
Less: accumulated depreciation |  |  | (42,804 | ) |  | (41,244 | )
Property and equipment, net |  |  | $ | 8,131 |  |  | $ | 8,219 |
Depreciation expense on property and equipment was $1.8 million and $1.9 million for the three months ended March 31, 2017 and 2016, respectively. Goodwill and Intangible Assets Goodwill as of March 31, 2017 and December 31, 2016 was $1.3 million. Purchased intangible assets, net, consisted of the following (in thousands):
| March 31, 2017 |  | December 31, 2016
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Developed technology | $ | 5,050 |  |  | $ | (758 | ) |  | $ | 4,292 |  |  | $ | 5,050 |  |  | $ | (505 | ) |  | $ | 4,545 |
Patents | 2,936 |  |  | (956 | ) |  | 1,980 |  |  | 2,936 |  |  | (848 | ) |  | 2,088 |
Total | $ | 7,986 |  |  | $ | (1,714 | ) |  | $ | 6,272 |  |  | $ | 7,986 |  |  | $ | (1,353 | ) |  | $ | 6,633 |
Amortization expense related to purchased intangible assets was $0.4 million and $33,000 for the three months ended March 31, 2017 and 2016, respectively. Purchased intangible assets are amortized over a remaining weighted average useful life of 4.4 years. Future amortization expense for purchased intangible assets as of March 31, 2017 is as follows (in thousands):
Fiscal Year |  |
Remainder of 2017 |  | $ | 1,082 |
2018 |  | 1,442 |
2019 |  | 1,442 |
2020 |  | 1,442 |
2021 |  | 864 |
|  | $ | 6,272 |
Accrued Liabilities
| March 31, 2017 |  | December 31, 2016
| (in thousands)
Accrued compensation and benefits | $ | 20,852 |  |  | $ | 22,326 |
Accrued tax liabilities | 2,894 |  |  | 3,340 |
Other | 6,141 |  |  | 5,859 |
Total accrued liabilities | $ | 29,887 |  |  | $ | 31,525 |
Deferred Revenue
| March 31, 2017 |  | December 31, 2016
| (in thousands)
Deferred revenue: |  |  |
Products | $ | 3,355 |  |  | $ | 4,182 |
Services | 89,750 |  |  | 88,726 |
Total deferred revenue | 93,105 |  |  | 92,908 |
Less: current portion | (58,780 | ) |  | (61,334 | )
Non-current portion | $ | 34,325 |  |  | $ | 31,574 |

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