CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	[1]
Current assets:
Cash and cash equivalents	$ 1,043,241	$ 1,832,684
Marketable securities-available-for-sale (amortized cost $258,622; allowance for credit losses $0)	259,351	284,870
Accounts receivable	351,522	308,809
Inventory	13,977	11,400
Prepaid expenses and other current assets	48,078	43,725
Total current assets	1,716,169	2,481,488
Restricted cash and investments	2,548	1,023
Long term investments	180,993	133,657
Inventory	8,240	5,105
Property and equipment, net	410,034	377,567
Finance lease right-of-use assets, net	28,622	29,058
Other intangible assets, net	188,444	193,828
Goodwill	155,593	155,593
Other assets, net	61,779	49,431
Total assets	2,752,422	3,426,750
Current liabilities:
Accounts payable	60,937	83,647
Accrued compensation	57,779	90,706
Interest payable	89	29
Accrued and other current liabilities	330,034	285,950
Finance lease liabilities	910	664
Convertible senior notes	18,524	18,300
Acquisition-related contingent consideration	35,139	34,044
Total current liabilities	503,412	513,340
Acquisition-related contingent consideration	239,861	242,956
Finance lease liabilities	31,959	31,918
Other liabilities	39,469	40,130
Total liabilities	814,701	828,344
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of March 31, 2020 and December 31, 2019
Common stock, $0.001 par value; 400,000,000 shares authorized; 216,952,325 and 216,177,830 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	217	216
Additional paid-in capital	4,102,011	4,044,490
Accumulated other comprehensive loss	(13,107)	(15,542)
Accumulated deficit	(2,151,400)	(1,430,758)
Total stockholders' equity	1,937,721	2,598,406
Total liabilities and stockholders' equity	$ 2,752,422	$ 3,426,750

[1] The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited consolidated financial statements at that date.