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Balance Sheet Details - Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property and equipment, net |  |  |
Property and equipment, gross | $ 28,073 | $ 18,249 |
Less accumulated depreciation and amortization | (8,920) | (6,455) |
Property and equipment, net | 19,153 | 11,794 | $ 7,593
Depreciation and amortization | 6,264 | 5,482 | 4,722
Buildings |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 874 | 874 |
Equipment |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 10,306 | 8,311 |
Furniture and fixtures |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 1,570 | 1,382 |
Leasehold improvements |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 4,792 | 4,568 |
Computer equipment and software |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 2,232 | 1,980 |
Land |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 7,068 |  |
Construction in progress |  |  |
Property and equipment, net |  |  |
Property and equipment, gross | 1,231 | 1,134 |
Property, Plant and Equipment |  |  |
Property and equipment, net |  |  |
Depreciation and amortization | $ 3,100 | $ 2,100 | $ 1,100

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