Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 19,813,349		$ 38,000,171	$ 25,736,158		$ 40,200,324
Prepaid expenses and other current assets	697,178		513,688
Total current assets	20,510,527		38,513,859
Property and equipment, net	156,648		164,035
Other assets	338,916		338,916
Total assets	21,006,091		39,016,810
Current liabilities:
Accounts payable	474,773		2,223,693
Accrued expenses	2,640,208		2,103,021
Notes payable, net of discount	1,328,973		5,948,763
Other current liabilities	495,169		487,488
Total current liabilities	4,939,123		10,762,965
Notes payable, net of discount	0		332,898
Deferred revenue	0		500,000
Other non-current liabilities	0		456,038
Total liabilities	4,939,123		12,051,901
Stockholders' equity:
Preferred stock of $0.01 par value - authorized 10,000,000 shares: Series A Convertible: issued and outstanding 4,030 shares as of March 31, 2019 and June 30, 2018	40		40
Common stock of $0.01 par value - authorized 300,000,000 shares: issued and outstanding 203,063,429 shares as of March 31, 2019 and 200,554,205 shares as of June 30, 2018	2,030,634		2,005,542
Additional paid-in capital	362,033,736		357,005,233
Accumulated deficit	(347,997,442)		(332,045,906)
Total stockholders' equity	16,066,968	$ 21,139,698	26,964,909	$ 10,226,387	$ 9,626,053	$ (5,164,644)
Total liabilities and stockholders' equity	$ 21,006,091		$ 39,016,810