Consolidated Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2019

Inventories, net consists of the following:


	December 31,
	2019		2018
	(Amounts in thousands)
Raw materials	$	29,328	$	24,937
Work-in-process		8,360		5,185
Finished products		17,144		12,141

Total inventories, net	$	54,832	$	42,263

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:


	December 31,
	2019		2018
	(Amounts in thousands)
Equipment maintenance and services	$	1,662	$	1,677
Prepaid taxes		2,719		843
Prepaid insuran c e		80		629
Deferred costs		—		55
Other		1,456		697

Total prepaid expenses and other current assets	$	5,917	$	3,901

Property, Plant and Equipment

Property, plant and equipment consist of the following:


	December 31,
	2019			2018
	(Amounts in thousands)
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 the Company’s Waltham and Marlborough, Massachusetts facilities,

$1.1

million of other manufacturing improvements in Waltham and Marlboro,

$0.6

million in manufacturing improvements at the Company’s Rancho Dominguez, California facility and

$0.4

million for a buildout at the Company’s Bridgewater, New Jersey facility. Construction in progress as of December 31, 2018 includes $7.3 million for the buildout of the Company’s Marlborough facility, $2.1 million in capitalized

internal-use

software development costs and $2.1 million for a casting machine, among other projects.

Depreciation expense totaled $7.3 million, $5.2 million and $4.2 million in the fiscal years ended December 31, 2019, 2018 and 2017, respectively.

Accrued Liabilities

Accrued liabilities consist of the following:


	December 31,
	2019		2018
	(Amounts in thousands)
Employee compensation	$	19,850	$	9,953
Taxes		3,874		1,024
Royalty and license fees		123		242
Warranties		1,500		546
Professional fees		1,081		942
Deferred revenue		5,005		1,290
Other		1,898		1,868

Total accrued liabilities	$	33,331	$	15,865