CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,326,730	$ 1,832,684
Marketable securities-available-for-sale (amortized cost $262,556; allowance for credit losses $0)	262,756	284,870
Accounts receivable	420,250	308,809
Inventory	16,335	11,400
Prepaid expenses and other current assets	51,554	43,725
Total current assets	2,077,625	2,481,488
Restricted cash and investments	2,583	1,023
Long term investments	248,731	133,657
Inventory	9,554	5,105
Property and equipment, net	453,777	377,567
Finance lease right-of-use assets, net	28,133	29,058
Other intangible assets, net	183,060	193,828
Goodwill	155,593	155,593
Other assets, net	53,265	49,431
Total assets	3,212,321	3,426,750
Current liabilities:
Accounts payable	90,909	83,647
Accrued compensation	67,396	90,706
Interest payable	29	29
Accrued and other current liabilities	340,890	285,950
Finance lease liabilities	1,189	664
Convertible senior notes	18,588	18,300
Acquisition-related contingent consideration	37,512	34,044
Total current liabilities	556,513	513,340
Acquisition-related contingent consideration	236,488	242,956
Finance lease liabilities	31,917	31,918
Other liabilities	42,799	40,130
Total liabilities	867,717	828,344
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of June 30, 2020 and December 31, 2019
Common stock, $0.001 par value; 400,000,000 shares authorized; 218,069,218 and 216,177,830 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	218	216
Additional paid-in capital	4,217,911	4,044,490
Accumulated other comprehensive loss	(12,423)	(15,542)
Accumulated deficit	(1,861,102)	(1,430,758)
Total stockholders' equity	2,344,604	2,598,406
Total liabilities and stockholders' equity	$ 3,212,321	$ 3,426,750