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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | $ 5,244 |  | $ 5,244 |  | $ 4,918
Less: Accumulated depreciation and amortization | (3,196) |  | (3,196) |  | (3,022)
Property and equipment, net | 2,048 |  | 2,048 |  | 1,896
Depreciation expense | 200 | $ 300 | 500 | $ 800 |
Machinery and equipment |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | 3,670 |  | 3,670 |  | 3,428
Construction in progress |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | 660 |  | 660 |  | 879
Computer and office equipment |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | 325 |  | 325 |  | 310
Leasehold improvements |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | 443 |  | 443 |  | 272
Furniture and fixtures |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Property and equipment, gross | $ 146 |  | $ 146 |  | $ 29

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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