Property and Equipment Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 22,528	$ 19,639
Accumulated depreciation and amortization	(7,630)	(11,509)
Total property and equipment, net	14,898	8,130
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	74	6,864
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,833	1,945
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	3,306	2,915
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,061	901
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	12,881	5,715
Consigned equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 1,373	$ 1,299