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Balance Sheets
$ in Thousands
Sep. 30, 2018
USD ($)
Current assets  
Cash and cash equivalents $ 34,996
Marketable securities 236,605
Accounts receivable 2,462
Income tax receivable 762
Prepaid expenses and other current assets 12,095
Total current assets 286,920
Property and equipment, net 9,688
Patents, licenses, and other intangible assets, net 11,677
Marketable securities - long term 276,228
Income tax receivable 762
Other assets 311
Total assets 585,586
Current liabilities  
Accounts payable 5,983
Accrued expenses 5,671
Current portion of deferred rent 294
Deferred revenue 40,079
Total current liabilities 52,027
Deferred rent, less current portion 1,286
Total liabilities 53,313
Commitments and contingencies
Stockholders' equity  
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at September 30, 2018 and December 31, 2017
Common stock, $0.01 par value: 200,000,000 authorized shares at September 30, 2018 and December 31, 2017; 56,212,449 issued and outstanding at September 30, 2018 and 47,002,488 issued and outstanding at December 31, 2017 562
Additional paid-in capital 839,127
Accumulated other comprehensive loss (2,338)
Accumulated deficit (305,078)
Total stockholders' equity 532,273
Total liabilities and stockholders' equity $ 585,586