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Condensed Consolidated Balance Sheets - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 3,371,303 $ 11,444,055
Investment securities - available for sale, at fair value 18,579,731 12,724,020
Accrued interest receivable on investment securities 76,746 54,440
Advances, deposits and other current assets 224,614 89,186
Subtotal current assets 22,252,394 24,311,701
Property and equipment (at cost, less accumulated depreciation and amortization of $2,929,742 and $2,838,716, respectively) 166,523 175,771
Other assets:    
In-process research and development 15,736,491 20,246,491
Other intangible assets, net 625,121 795,608
Goodwill 1,976,101 1,976,101
Patent licensing fees, deposits and other assets, net 155,324 8,761
Subtotal other assets 18,493,037 23,026,961
Total assets 40,911,954 47,514,433
Current liabilities:    
Accounts payable ? trade 3,159,627 3,416,863
Other accrued liabilities 2,140,128 2,282,827
Deferred revenue - current portion 500,000 500,000
Subtotal current liabilities 5,799,755 6,199,690
Earn-out milestone liability 8,970,854 12,538,525
Notes payable - non-current portion 9,319,579
Deferred revenue - non-current portion 1,625,000 2,000,000
Other liabilities - non-current portion 65,701 71,710
Total liabilities 25,780,889 20,809,925
Stockholders equity:    
Preferred Stock - $0.01 par value (100,000 shares authorized; no shares issued or outstanding at September 30, 2018 and December 31, 2017)
Common stock - $0.01 par value (112,500,000 shares authorized; 17,911,454 and 17,277,299 shares issued at September 30, 2018 and December 31, 2017, respectively;17,911,120 and 17,276,965 shares outstanding at September 30, 2018 and December 31, 2017, respectively) 179,114 172,772
Additional paid-in capital 294,162,004 288,408,976
Accumulated other comprehensive gain (loss) 20,960 (10,164)
Accumulated deficit (279,145,825) (261,781,888)
Subtotal 15,216,253 26,789,696
Treasury stock, at cost (334 shares at September 30, 2018 and December 31, 2017) (85,188) (85,188)
Total stockholders equity 15,131,065 26,704,508
Total liabilities and stockholders equity $ 40,911,954 $ 47,514,433