Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 3,629,038	$ 2,624,162
Investment securities – available for sale, at fair value		1,680,000
Accrued interest receivable on investment securities		4,008
Advances, deposits and other current assets	109,947	204,408
Subtotal current assets	3,738,985	4,512,578
Property and equipment (at cost, less accumulated depreciation and amortization of $2,740,422 and $2,513,022, respectively)	256,562	462,836
Other assets:
In-process research and development	22,766,491	22,766,491
Other intangible assets, net	909,266	1,022,924
Goodwill	1,976,101	1,976,101
Security deposit on letter of credit		100,000
Patent licensing fees and other assets, net	8,761	8,761
Subtotal other assets	25,660,619	25,874,277
Total assets	29,656,166	30,849,691
Current liabilities:
Accounts payable - trade	3,544,583	2,878,978
Other accrued liabilities	2,911,891	2,483,756
Notes payable - current portion		2,560,553
Deferred revenue – current portion	500,000	500,000
Subtotal current liabilities	6,956,474	8,423,287
Earn-out milestone liability	13,764,205	13,188,226
Deferred revenue – non-current portion	2,250,000	2,500,000
Other liabilities – non-current	36,840	12,352
Total liabilities	23,007,519	24,123,865
Commitments and contingencies
Stockholders’ equity:
Preferred Stock - $0.01 par value (100,000 shares authorized and no shares issued or outstanding at June 30, 2017 and December 31, 2016, respectively)
Common stock - $0.01 par value (112,500,000 shares authorized; 5,914,560 and 2,230,452 shares issued at June 30, 2017 and December 31, 2016, respectively, and 5,914,226 and 2,230,118 shares outstanding at June 30, 2017 and December 31, 2016, respectively)	59,149	22,305
Additional paid-in capital	258,104,403	248,168,421
Accumulated deficit	(251,429,717)	(241,379,712)
Subtotal	6,733,835	6,811,014
Treasury stock, at cost (334 shares at June 30, 2017 and December 31, 2016)	(85,188)	(85,188)
Total stockholders’ equity	6,648,647	6,725,826
Total liabilities and stockholders’ equity	$ 29,656,166	$ 30,849,691