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Condensed Consolidated Financial Statement Details | 9 Months Ended
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Sep. 30, 2017
Property, Plant and Equipment [Abstract] |
Condensed Consolidated Financial Statement Details | Condensed Consolidated Financial Statement Details Inventory
| September 30, 2017 |  | December 31, 2016
| (in thousands)
Raw materials | $ | 6,985 |  |  | $ | 6,669 |
Finished goods | 8,959 |  |  | 8,401 |
Total inventory | $ | 15,944 |  |  | $ | 15,070 |
Property and Equipment, Net
| Useful Life |  | September 30, 2017 |  | December 31, 2016
| (in years) |  | (in thousands)
Equipment | 1-3 |  | $ | 46,161 |  |  | $ | 41,815 |
Software | 1-3 |  | 3,859 |  |  | 3,801 |
Furniture and fixtures | 1-3 |  | 820 |  |  | 865 |
Leasehold improvements | 2-8 |  | 3,772 |  |  | 2,724 |
Construction in progress |  |  | 74 |  |  | 258 |
Property and equipment, gross |  |  | 54,686 |  |  | 49,463 |
Less: accumulated depreciation |  |  | (45,155 | ) |  | (41,244 | )
Property and equipment, net |  |  | $ | 9,531 |  |  | $ | 8,219 |
Depreciation expense on property and equipment was $1.5 million and $1.9 million for the three months ended September 30, 2017 and 2016, respectively, and $5.1 million and $5.6 million for the nine months ended September 30, 2017 and 2016, respectively. Goodwill and Intangible Assets Goodwill as of September 30, 2017 and December 31, 2016 was $1.3 million. Purchased intangible assets, net, consisted of the following (in thousands):
| September 30, 2017 |  | December 31, 2016
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Developed technology | $ | 5,050 |  |  | $ | (1,262 | ) |  | $ | 3,788 |  |  | $ | 5,050 |  |  | $ | (505 | ) |  | $ | 4,545 |
Patents | 2,936 |  |  | (1,173 | ) |  | 1,763 |  |  | 2,936 |  |  | (848 | ) |  | 2,088 |
Total | $ | 7,986 |  |  | $ | (2,435 | ) |  | $ | 5,551 |  |  | $ | 7,986 |  |  | $ | (1,353 | ) |  | $ | 6,633 |
Amortization expense related to purchased intangible assets was $0.4 million and $0.3 million for the three months ended September 30, 2017 and 2016, respectively, and $1.1 million and $0.4 million for the nine months ended September 30, 2017 and 2016, respectively. Purchased intangible assets will be amortized over a remaining weighted average useful life of 3.9 years. Future amortization expense for purchased intangible assets as of September 30, 2017 is as follows (in thousands):
Fiscal Year |  |
Remainder of 2017 |  | $ | 361 |
2018 |  | 1,442 |
2019 |  | 1,442 |
2020 |  | 1,442 |
2021 |  | 864 |
|  | $ | 5,551 |
Accrued Liabilities
| September 30, 2017 |  | December 31, 2016
| (in thousands)
Accrued compensation and benefits | $ | 19,828 |  |  | $ | 22,326 |
Accrued tax liabilities | 3,040 |  |  | 3,340 |
Other | 4,736 |  |  | 5,859 |
Total accrued liabilities | $ | 27,604 |  |  | $ | 31,525 |
Deferred Revenue
| September 30, 2017 |  | December 31, 2016
| (in thousands)
Deferred revenue: |  |  |
Products | $ | 3,076 |  |  | $ | 4,182 |
Services | 87,928 |  |  | 88,726 |
Total deferred revenue | 91,004 |  |  | 92,908 |
Less: current portion | (59,294 | ) |  | (61,334 | )
Non-current portion | $ | 31,710 |  |  | $ | 31,574 |

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