CONDENSED BALANCE SHEETS - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 24,427,000	$ 10,271,000
Marketable securities	58,855,000	79,538,000
Prepaid expenses and other assets	1,389,000	1,343,000
Other receivable - related party	6,000
Total current assets	84,677,000	91,152,000
Property, plant and equipment, net	1,013,000	255,000
Operating lease right-of-use asset	275,000
Deposits	14,000	499,000
Total assets	85,979,000	91,906,000
Current liabilities:
Accounts payable	1,136,000	922,000
Accrued expenses	1,804,000	1,517,000
Accounts payable and accrued expenses - related party		38,000
Operating lease liability	122,000
Total current liabilities	3,062,000	2,477,000
Operating lease liability	156,000
Total liabilities	3,218,000	2,477,000
Commitments and Contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding as of March 31, 2019 and December 31, 2018
Common stock, $0.0001 par value; 200,000,000 authorized as of March 31, 2019 and December 31, 2018; 25,813,629 shares issued and 25,708,485 shares outstanding as of March 31, 2019 and 25,809,900 shares issued and 25,704,756 shares outstanding as of December 31, 2018, respectively	3,000	3,000
Treasury stock, at cost, 105,144 shares as of March 31, 2019 and December 31, 2018	0	0
Additional paid-in capital	123,211,000	122,526,000
Accumulated deficit	(40,464,000)	(33,083,000)
Accumulated other comprehensive gain (loss)	11,000	(17,000)
Total stockholders’ equity	82,761,000	89,429,000
Total liabilities and stockholders’ equity	$ 85,979,000	$ 91,906,000