Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Total revenues	$ 244,632	$ 378,325
Costs and expenses:
Cost of revenue	0	597,457
Research and development	11,162,236	8,164,011
Selling, general and administrative	5,760,890	8,005,583
Restructuring charges	0	664,686
Total operating expenses	16,923,126	17,431,737
Loss from operations	(16,678,494)	(17,053,412)
Interest income	234,169	219,430
Interest expense	0	(25,409)
Other gain (loss), net	1,978	(236,833)
Gain on extinguishment of debt	0	17,974
Gain from changes in fair value of derivative financial instruments—warrants	28,188	617,072
Net loss	(16,414,159)	(16,461,178)
Preferred stock dividend payable on Series A Convertible Preferred Stock	(24,240)	(24,240)
Net loss attributable to common stockholders	$ (16,706,668)	$ (19,254,951)
Net loss per common share - basic and diluted (in dollars per share)	$ (2.80)	$ (8.26)
Weighted-average shares outstanding - basic and diluted (in shares)	5,973,906	2,330,180
Royalties
Royalties	$ 243,137	$ 250,453
Services
Services	1,495	127,872
Series B Convertible Preferred Stock
Costs and expenses:
Deemed dividend recognized on beneficial conversion features of Convertible Preferred Stock issuance	0	(2,769,533)
Series C Convertible Preferred Stock
Costs and expenses:
Deemed dividend recognized on beneficial conversion features of Convertible Preferred Stock issuance	$ (268,269)	$ 0