OTHER ASSETS (Tables)

12 Months Ended

Dec. 31, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Summary of Other Current Assets

The following table summarizes the Company’s other current assets for each of the periods indicated:

	As of December 31,
	2021		2020
	(in thousands)
Manufacturing-related deposits and prepaids	$	93,656	$	134,430
Collaboration receivable		18,647		34,184
Prepaid clinical and pre-clinical expenses		12,667		16,224
Prepaid maintenance services		8,452		6,411
Prepaid insurance		5,282		4,158
Prepaid research expenses		3,082		5,854
Prepaid income tax		1,100		4,939
Leasehold improvement receivable		—		3,059
Other		6,142		4,065
Total other current assets	$	149,028	$	213,324

Summary of Other Non-current Assets

The following table summarizes the Company’s other non-current assets for each of the periods indicated:

	As of December 31,
	2021		2020
	(in thousands)
Non-current inventory	$	129,521	$	—
Manufacturing-related deposits and prepaids		112,765		148,525
Strategic investments		34,892		38,799
Restricted cash and investments		9,904		9,315
Prepaid clinical expenses		2,007		3,395
Other		3,860		3,669
Total other non-current assets	$	292,949	$	203,703