CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 632,953	$ 397,664
Short-term investments	1,354,146	1,494,711
Contracts receivable	9,068	76,204
Inventories	22,930	21,965
Other current assets	136,643	140,163
Total current assets	2,155,740	2,130,707
Property, plant and equipment, net	180,144	181,077
Patents, net	30,038	27,937
Deposits and other assets	48,971	50,034
Total assets	2,414,893	2,389,755
Current liabilities:
Accounts payable	8,357	17,199
Accrued compensation	32,320	65,728
Accrued liabilities	75,681	90,161
Income taxes payable	450	1,324
1 percent convertible senior notes, net	61,936	308,809
Current portion of long-term obligations	3,109	7,301
Current portion of deferred contract revenue	97,925	108,376
Total current liabilities	279,778	598,898
Long-term deferred contract revenue	362,887	424,046
Long-term obligations, less current portion	21,628	23,409
Long-term mortgage debt	59,955	59,984
Total liabilities	1,884,357	1,646,473
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 shares authorized, 141,184,026 and 140,365,594 shares issued and outstanding at September 30, 2021 (unaudited) and December 31, 2020, respectively	141	140
Additional paid-in capital	1,942,348	1,895,519
Accumulated other comprehensive loss	(27,437)	(21,071)
Accumulated deficit	(1,384,516)	(1,131,306)
Total stockholders' equity	530,536	743,282
Total liabilities and stockholders' equity	2,414,893	2,389,755
0 Percent Convertible Senior Notes [Member]
Current liabilities:
Convertible senior notes, net	618,341	0
0.125 Percent Convertible Senior Notes [Member]
Current liabilities:
Convertible senior notes, net	$ 541,768	$ 540,136