Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (3,716)	$ (3,115)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	750	992
Depreciation and amortization	21	44
Gain on sale of property and equipment	(346)
Changes in operating assets and liabilities:
Other current assets	(729)	(152)
Accounts payable	12	46
Accrued development expense	(219)	259
Accrued compensation and benefits	22	(6)
Other current liabilities	(2)	7
Net cash used in operating activities	(4,207)	(1,925)
Cash flows from investing activities:
Purchases of property and equipment		(18)
Proceeds from sale of property and equipment	360
Net cash provided by / (used in) investing activities	360	(18)
Cash flows from financing activities:
Issuance costs from 2018 sale of common stock and warrants		(60)
Proceeds from exercise of common stock warrants, net	4,584
Proceeds from exercise of stock options	256
Net cash provided by / (used in) financing activities	4,840	(60)
Net increase / (decrease) in cash and cash equivalents	993	(2,003)
Cash and cash equivalents at beginning of period	23,081	19,807
Cash and cash equivalents at end of period	$ 24,074	$ 17,804