Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 12,601,878	$ 16,130,410
Insurance claims receivable	613,905	7,628
Prepaid expenses and other current assets	1,464,289	1,066,497
Total current assets	14,680,072	17,204,535
Equipment and furnishings, net	47,270	42,893
Other assets	16,836	7,590
Operating lease right-of-use assets	625,302
Total assets	15,369,480	17,255,018
Current liabilities:
Accounts payable	3,136,376	887,835
Accrued expenses and other current liabilities	1,378,349	1,162,471
Current portion of operating lease liabilities	174,772
Total current liabilities	4,689,497	2,050,306
Operating lease liabilities, net of current portion	464,505
Total liabilities	5,154,002	2,050,306
Commitments and contingencies
Stockholders' equity:
Preferred Stock, $0.01 par value, 833,333 shares authorized, including 50,000 shares of Series B Junior Participating Preferred Stock; no shares issued and outstanding
Common stock, $0.001 par value, 41,666,666 shares authorized; 36,480,038 and 33,637,501 shares issued and outstanding, respectively, at September 30, 2020 and December 31, 2019	36,480	33,637
Additional paid-in capital	479,494,604	479,197,849
Accumulated deficit	(469,315,606)	(464,026,774)
Total stockholders' equity	10,215,478	15,204,712
Total liabilities and stockholders' equity	$ 15,369,480	$ 17,255,018