Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 16,350,237	$ 17,623,770
Restricted cash	174,950	171,553
Short-term investments	11,984,157
Trade receivables, net	35	10,904
Inventories, net	338,465	428,515
Prepaid research and development expenses	34,831	8,113
Security deposit	20,000
Other prepaid expenses and current assets	446,415	422,199
Total current assets	29,349,090	18,665,054
Property and equipment, net	126,820	160,860
TOTAL ASSETS	29,475,910	18,825,914
Current liabilities
Accounts payable	1,024,280	2,588,977
Accrued expenses	4,800,486	5,166,224
Deferred revenue	2,206	11,029
Total current liabilities	5,826,972	7,766,230
Operating lease liabilities, net of current portion	2,678
Convertible note, related party, net		6,125,428
TOTAL LIABILITIES	5,829,650	13,891,658
COMMITMENTS AND CONTINGENCIES (Note 7)
STOCKHOLDERS' EQUITY
Preferred stock - $0.001 par value: 2,000,000 shares authorized; 241,623 and 419,585 shares issued and outstanding at December 31, 2019 and 2018	242	420
Common stock - $0.001 par value: 160,000,000 shares authorized at December 31, 2019; 25,665,350 and 21,775,173 shares issued and outstanding at December 31, 2019 and 2018, respectively	25,665	21,775
Accumulated other comprehensive gain	97,257	96,522
Additional paid-in capital	218,944,268	183,803,637
Accumulated deficit	(195,421,172)	(178,988,098)
TOTAL STOCKHOLDERS' EQUITY	23,646,260	4,934,256
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 29,475,910	$ 18,825,914