Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 52,334,102	$ 65,675,931
Deferred offering costs	4,070,690
Prepaid expenses and other current assets	339,814	322,146
Total current assets	56,744,606	65,998,077
Property and equipment, net	31,032	24,450
Right of use lease asset	560,318
Other noncurrent assets	102	111
Total assets	57,336,058	66,022,638
Current liabilities:
Accounts payable	3,510,105	1,739,337
Accrued expenses	5,847,364	3,128,772
Lease liability-current	226,852
Total current liabilities	9,584,321	4,868,109
Lease liability-noncurrent	358,404
Total liabilities	9,942,725	4,868,109
Commitments and contingencies (Note 8)
Stockholders' equity (deficit):
Common stock, par value $0.001 at September 30, 2019 and $0.11 at December 31, 2018; 1,181,733 and 1,155,366, shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively.	1,182	127,091
Additional paid-in capital	20,346,849	19,666,588
Accumulated other comprehensive loss	(13,688,166)	(8,761,325)
Accumulated deficit	(77,455,525)	(62,468,456)
Total stockholders' deficit	(70,795,660)	(51,436,102)
Total liabilities, convertible preferred stock and stockholders' deficit	57,336,058	66,022,638
Convertible preferred stock
Convertible preferred stock:
Total convertible preferred stock	118,188,993	112,590,631
Series A convertible preferred stock
Convertible preferred stock:
Total convertible preferred stock	6,483,044	6,483,044
Series B convertible preferred stock
Convertible preferred stock:
Total convertible preferred stock	49,742,942	49,742,942
Series C convertible preferred stock
Convertible preferred stock:
Total convertible preferred stock	$ 61,963,007	$ 56,364,645