Statements Of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (2,286,000)	$ (2,418,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	522,000	673,000
Depreciation and amortization	20,000	30,000
Gain on sale of property and equipment	(346,000)
Changes in operating assets and liabilities:
Other current assets	82,000	184,000
Accounts payable	(37,000)	300,000
Accrued development expense	(22,000)	23,000
Accrued compensation and benefits	26,000	(1,000)
Other current liabilities	5,000	14,000
Net cash used in operating activities	(2,036,000)	(1,195,000)
Cash flows from investing activities:
Purchases of property and equipment		(18,000)
Proceeds from sale of property and equipment	360,000	0
Net cash provided by / (used in) investing activities	360,000	(18,000)
Cash flows from financing activities:
Issuance costs from 2018 sale of common stock and warrants		(60,000)
Proceeds from exercise of common stock warrants, net	3,849,000
Net cash provided by / (used in) financing activities	3,849,000	(60,000)
Net increase / (decrease) in cash and cash equivalents	2,173,000	(1,273,000)
Cash and cash equivalents at beginning of period	23,081,000	19,807,000
Cash and cash equivalents at end of period	$ 25,254,000	$ 18,534,000