Summary of Significant Accounting Policies (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Property, Plant and Equipment, Net

Property, plant and equipment, net consists of the following as of March 31, 2022 and December 31, 2021:

	As of
	March 31, 2022		December 31, 2021
	(In thousands)
Leasehold improvements	$	23,724	$	23,501
Machinery and equipment	60,005		59,358
Aircraft	8,000		8,000
IT software and equipment	22,747		22,397
Construction in progress	26,942		23,167
	141,418		136,423
Less: accumulated depreciation and amortization	(77,915)		(74,998)
Property, plant and equipment, net	$	63,503	$	61,425

Depreciation expense recorded in the condensed consolidated statements of operations and comprehensive loss during the three months ended March 31, 2022 and 2021 consisted of the following:

	Three Months Ended March 31,
	2022		2021
	(In thousands)
Cost of revenue	$	249	$	—
Research and development, net	130		874
Selling, general and administrative	2,423		2,249
Total depreciation expense	$	2,802	$	3,123

The estimated useful lives for each class of property, plant and equipment are as follows:

Leasehold improvements	Shorter of the estimated useful life or lease term
Machinery and equipment	5 to 7 years
Aircraft	15 years
IT software and equipment	3 to 5 years

Property, plant and equipment, net consists of the following as of December 31, 2021, and December 31, 2020:

	As of
	December 31, 2021		December 31, 2020
	(In thousands)
Leasehold improvements	$	23,501	$	20,769
Machinery and equipment	59,358		50,285
Aircraft	8,000		8,000
IT software and equipment	22,397		20,190
Construction in progress	23,167		11,898
	136,423		111,142
Less: accumulated depreciation and amortization	(74,998)		(62,039)
Property, plant and equipment, net	$	61,425	$	49,103

Depreciation expense recorded in the consolidated statements of operations and comprehensive loss during the years ended December 31, 2021 and 2020 consisted of the following:

	Years Ended December 31,
	2021		2020
	(In thousands)
Cost of revenue	$	556	$	—
Research and development, net	1,348		9,333
Selling, general and administrative	10,385		2,855
Total depreciation expense	$	12,289	$	12,188