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Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 176,965 $ 163,544
Marketable securities 368,878 434,156
Equity securities 6,136 5,303
Accounts receivable 12,525 11,443
Contract asset 12,500 12,500
Prepaid expenses and other current assets 14,164 10,726
Total current assets 591,168 637,672
Property and equipment, net 22,301 21,682
Patents, licenses, and other intangible assets, net 15,550 15,977
Marketable securities - long term 25,082 1,030
Equity securities - long term 28,219 16,071
Other assets 10,417 10,812
Total assets 692,737 703,244
Current liabilities    
Accounts payable 7,663 8,954
Accrued expenses 12,513 17,603
Lease liabilities 1,934 1,889
Deferred revenue 77,821 92,615
Total current liabilities 99,931 121,061
Lease liabilities, net of current portion 9,194 9,739
Total liabilities 109,125 130,800
Commitments and contingencies
Stockholders' equity    
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at March 31, 2021 and December 31, 2020
Common stock, $0.01 par value: 200,000,000 authorized shares at March 31, 2021 and December 31, 2020; 58,221,953 issued and outstanding at March 31, 2021 and 57,873,444 issued and outstanding at December 31, 2020 583 580
Additional paid-in capital 951,154 937,525
Accumulated other comprehensive income 97 74
Accumulated deficit (368,222) (365,735)
Total stockholders' equity 583,612 572,444
Total liabilities and stockholders' equity $ 692,737 $ 703,244