Supplemental Disclosures (Tables)

3 Months Ended

Mar. 31, 2021

Payables And Accruals [Abstract]

Schedules of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Accrued purchases of property and equipment	$	11,231	$	7,853
Accrued personnel costs		7,970		13,155
Accrued external research and development expenses		7,792		9,738
Accrued sublicense fees and royalties		6,828		12,160
Accrued income taxes payable		4,005		3,135
Accrued external general and administrative expenses		3,657		2,865
Other accrued expenses and current liabilities		122		176
	$	41,605	$	49,082