Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Revenues, Total	$ 5,407,000	$ 1,503,000
Operating expenses:
Research and development	3,829,000	3,408,000
General and administrative	2,026,000	2,010,000
Total operating expenses	5,855,000	5,418,000
Operating loss	(448,000)	(3,915,000)
Other income and (expenses):
Bargain purchase gain		6,988,000
Interest income	5,000	5,000
Interest expense	(107,000)	(437,000)
Non-cash interest expense related to sale of future royalties	(544,000)	(298,000)
Loss on revaluation of financial instruments		(3,000)
Foreign exchange gain, net	5,000	2,000
Total other income and (expenses)	(641,000)	6,257,000
Net (loss) income before income taxes	(1,089,000)	2,342,000
Provision for income taxes	250,000	28,000
Net (loss) income	(1,339,000)	2,314,000
Series B and C preferred dividend		(339,000)
Net comprehensive (loss) income attributable to common stockholders	$ (1,339,000)	$ 1,975,000
Net (loss) income per share - basic (in dollars per share)	$ (0.18)	$ 0.54
Net (loss) income per share - diluted (in dollars per share)	$ (0.18)	$ 0.49
Shares used to compute net (loss) income per share - basic (in shares)	7,301,189	3,656,360
Shares used to compute net (loss) income per share - diluted (in shares)	7,301,189	5,299,751
Government Contract [Member]
Revenue:
Revenues, Total		$ 610,000
Royalty [Member]
Revenue:
Revenue from Contract with Customer, Including Assessed Tax	3,659,000	893,000
Non Cash Royalty Revenue [Member]
Revenue:
Revenue from Contract with Customer, Including Assessed Tax	$ 1,748,000