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Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 143,480 $ 163,544
Marketable debt securities 153,767 434,156
Marketable equity securities 36,860 5,303
Accounts receivable 66,384 11,443
Contract asset   12,500
Prepaid expenses and other current assets 23,877 10,726
Total current assets 424,368 637,672
Property and equipment, net 28,240 21,682
Patents, licenses, and other intangible assets, net 16,493 15,977
Marketable debt securities - long term 300,465 1,030
Marketable equity securities - long term 31,262 16,071
Notes receivable - long term 5,000  
Right-of-use assets 31,730 10,600
Other assets 653 212
Total assets 838,211 703,244
Current liabilities    
Accounts payable 14,001 8,954
Accrued expenses 19,443 17,603
Lease liabilities   1,889
Deferred revenue 37,294 92,615
Total current liabilities 70,738 121,061
Lease liabilities, net of current portion 33,969 9,739
Total liabilities 104,707 130,800
Commitments and contingencies (see note 9)
Stockholders' equity    
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at December 31, 2021 and 2020
Common stock, $0.01 par value: 200,000,000 authorized shares; 59,355,558 issued and outstanding shares at December 31, 2021 and 557,873,444 issued and outstanding at December 31, 2020 595 580
Additional paid-in capital 1,017,523 937,525
Accumulated other comprehensive income (1,510) 74
Accumulated deficit (283,104) (365,735)
Total stockholders' equity 733,504 572,444
Total liabilities and stockholders' equity $ 838,211 $ 703,244