Property, Plant and Equipment (Detail) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Land		$ 1,023	$ 1,023
Buildings		764	764
Leasehold improvements		23,905	16,259
Equipment		36,257	24,092
Furniture, fixtures and office equipment		6,312	4,914
Computer hardware and software		8,810	534
Construction in progress	[1]	6,707	12,906
Other		56
Total property, plant and equipment		83,834	60,492
Less - Accumulated depreciation		(35,379)	(28,312)
Total property, plant and equipment, net		$ 48,455	$ 32,180

[1] Construction in progress as of December 31, 2019 primarily includes $4.2 million for the buildout of our Waltham and Marlborough, Massachusetts facilities, $1.1 million of other manufacturing improvements in Waltham and Marlboro and $0.6 million in manufacturing improvements at our Rancho Dominguez, California facility. Construction in progress as of December 31, 2018 includes $7.3 million for the buildout of our Marlborough facility, $2.1 million in capitalized internal-use software development costs and $2.1 million for a casting machine, among other projects.