CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,513,008	$ 1,832,684
Marketable securities-available-for-sale (amortized cost $288,199; allowance for credit losses $0)	288,369	284,870
Accounts receivable	481,994	308,809
Inventory	16,425	11,400
Prepaid expenses and other current assets	60,098	43,725
Total current assets	2,359,894	2,481,488
Restricted cash and investments	1,757	1,023
Long term investments	222,301	133,657
Inventory	19,548	5,105
Property and equipment, net	559,625	377,567
Finance lease right-of-use assets, net	28,451	29,058
Other intangible assets, net	172,291	193,828
Goodwill	155,593	155,593
Other assets, net	41,458	49,431
Total assets	3,560,918	3,426,750
Current liabilities:
Accounts payable	98,767	83,647
Accrued compensation	113,340	90,706
Accrued and other current liabilities	378,404	285,979
Finance lease liabilities	2,284	664
Convertible senior notes		18,300
Acquisition-related contingent consideration	38,400	34,044
Total current liabilities	631,195	513,340
Acquisition-related contingent consideration	227,600	242,956
Finance lease liabilities	32,573	31,918
Other liabilities	58,282	40,130
Total liabilities	949,650	828,344
Commitments and contingencies (Note 16)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of December 31, 2020 and December 31, 2019
Common stock, $0.001 par value; 400,000,000 shares authorized; 219,489,329 and 216,177,830 shares issued and outstanding as of December 31, 2020 and December 31, 2019, respectively	219	216
Additional paid-in capital	4,352,864	4,044,490
Accumulated other comprehensive loss	(15,360)	(15,542)
Accumulated deficit	(1,726,455)	(1,430,758)
Total stockholders' equity	2,611,268	2,598,406
Total liabilities and stockholders' equity	$ 3,560,918	$ 3,426,750