Additional Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2020

Accrued expenses consisted of the following:


	As of December 31,
	2020		2019
	(in thousands)
Product revenue accruals	$	781,903	$	641,368
Payroll and benefits	169,387		159,464
Research, development and commercial contract costs	136,704		105,663
Royalty payable	165,404		98,578
Tax related accruals	104,173		72,293
Other	47,400		39,546
Total	$	1,404,971	$	1,116,912

Summary Other Current Liabilities

Other current liabilities consisted of the following:


	As of December 31,
	2020		2019
	(in thousands)
Contract liabilities	$	191,519	$	62,332
Fair value of cash flow hedges	59,184		5,533
Finance lease liabilities	42,434		38,794
Other	24,286		23,646
Total	$	317,423	$	130,305

Additional Cash Flow Information

The cash, cash equivalents and restricted cash balances at the beginning and ending of each period presented in the Company’s consolidated statements of cash flows consisted of the following:


	As of December 31,
	2020		2019		2018		2017
	(in thousands)
Cash and cash equivalents	$	5,988,187	$	3,109,322	$	2,650,134	$	1,665,412
Prepaid expenses and other current assets	658		8,004		4,910		2,114
Other assets	—		3,355		3,209		—
Cash, cash equivalents and restricted cash per consolidated statement of cash flows	$	5,988,845	$	3,120,681	$	2,658,253	$	1,667,526