CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 521,917	$ 869,191
Short-term investments	1,499,910	1,245,782
Contracts receivable	6,751	61,896
Inventories	19,811	24,806
Other current assets	142,759	143,374
Total current assets	2,191,148	2,345,049
Property, plant and equipment, net	177,015	178,069
Patents, net	29,054	29,005
Deposits and other assets	58,916	59,567
Total assets	2,456,133	2,611,690
Current liabilities:
Accounts payable	10,351	11,904
Accrued compensation	24,985	38,810
Accrued liabilities	134,336	88,560
Income taxes payable	14	36
Current portion of long-term obligations	4,732	3,526
Current portion of deferred contract revenue	93,393	97,714
Total current liabilities	267,811	240,550
Long-term deferred contract revenue	315,196	351,879
Long-term obligations, less current portion	25,093	26,378
Long-term mortgage debt	59,222	59,713
Total liabilities	1,831,407	1,839,953
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 shares authorized, 141,830,659 and 141,210,015 shares issued and outstanding at June 30, 2022 (unaudited) and December 31, 2021, respectively	142	141
Additional paid-in capital	2,008,794	1,964,167
Accumulated other comprehensive loss	(54,007)	(32,668)
Accumulated deficit	(1,330,203)	(1,159,903)
Total stockholders' equity	624,726	771,737
Total liabilities and stockholders' equity	2,456,133	2,611,690
0 Percent Convertible Senior Notes [Member]
Current liabilities:
Convertible senior notes, net	620,678	619,119
0.125 Percent Convertible Senior Notes [Member]
Current liabilities:
Convertible senior notes, net	$ 543,407	$ 542,314