OTHER ASSETS (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019
	(in thousands)
Manufacturing-related deposits and prepaids	$	134,430	$	54,276
Collaboration receivable		34,184		—
Prepaid clinical and pre-clinical expenses		16,224		8,263
Prepaid maintenance services		6,411		4,366
Prepaid research expenses		5,854		2,007
Prepaid income tax		4,939		2,114
Prepaid insurance		4,158		2,573
Leasehold improvement receivable		3,059		3,059
Other		4,065		5,249
Total other current assets	$	213,324	$	81,907

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,
	2020		2019
	(in thousands)
Manufacturing-related deposits and prepaids	$	148,525	$	122,091
Strategic investments		38,799		31,937
Restricted cash and investments		9,315		9,566
Prepaid clinical expenses		3,395		4,665
Other		3,669		5,600
Total other non-current assets	$	203,703	$	173,859