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Condensed Consolidated Balance Sheets - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 18,339,728 $ 6,875,273
Investment in debt securities - available for sale, at fair value 7,985,886
Accrued interest receivable on investment securities 21,369
Advances and deposits on clinical programs and other current assets 1,565,651 1,352,670
Total current assets 19,905,379 16,235,198
Property and equipment (at cost, less accumulated depreciation of $3,213,681 and $3,096,681, respectively) 302,281 405,363
Other assets:    
Deferred tax asset 1,819,324
In-process research and development, net 13,366,234 15,736,491
Goodwill 1,976,101 1,976,101
Operating lease right-of-use assets, net 1,147,062 1,431,640
Other intangible assets, net 170,489 340,976
Deposits and other assets 407,284 333,274
Total other assets 17,067,170 21,637,806
Total assets 37,274,830 38,278,367
Current liabilities:    
Accounts payable - trade 2,168,076 2,862,949
Other accrued liabilities 1,919,779 2,303,547
Notes payable - current portion, net of deferred financing costs 416,476 1,840,228
Operating lease liability - current portion 421,564 387,733
Deferred revenue - current portion 500,000 500,000
Total current liabilities 5,425,895 7,894,457
Earn-out milestone liability 7,115,000 5,717,709
Notes payable - non-current portion, net of deferred financing costs 4,626,987 7,963,449
Operating lease liability - non-current portion 823,147 1,143,717
Deferred revenue - non-current portion 625,000 1,000,000
Total liabilities 18,616,029 23,719,332
Commitments and contingencies
Stockholders' equity:    
Preferred stock - $0.01 par value (100,000 shares authorized, and no shares issued or outstanding at September 30, 2020 and December 31, 2019)
Common stock - $0.01 par value (112,500,000 shares authorized; 36,160,114 and 23,256,152 shares issued at September 30, 2020 and December 31, 2019, respectively, and 36,159,780 and 23,255,818 shares outstanding at September 30, 2020 and December 31, 2019, respectively) 361,601 232,562
Additional paid-in capital 327,370,577 304,885,663
Accumulated other comprehensive gain 42,778
Accumulated deficit (308,988,189) (290,516,780)
Total stockholders' equity before treasury stock 18,743,989 14,644,223
Treasury stock, at cost (334 shares at September 30, 2020 and December 31, 2019) (85,188) (85,188)
Total stockholders' equity 18,658,801 14,559,035
Total liabilities and stockholders' equity $ 37,274,830 $ 38,278,367