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STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
License fees and royalties	$ 460,000	$ 1,066,000	$ 1,065,000
Operating expenses:
Research and development	52,072,000	13,432,000	11,033,000
General and administrative	20,893,000	18,707,000	19,287,000
Total operating expenses	72,965,000	32,139,000	30,320,000
Loss from operations	(72,505,000)	(31,073,000)	(29,255,000)
Interest and other income	4,221,000	3,291,000	1,416,000
Gain on settlement		1,460,000
Change in fair value of equity investment	(195,000)	(541,000)
Other expense	(69,000)	(154,000)	(77,000)
Net loss	$ (68,548,000)	$ (27,017,000)	$ (27,916,000)
Basic and diluted net loss per share	$ (0.36)	$ (0.15)	$ (0.18)
Shares used in computing basic and diluted net loss per share	190,160,311	176,504,996	159,224,986

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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