Agreement termination rights grant date.

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Cash required in matching funds raised.

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Cash required to raise in matching funds.

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Matching funds required to raise over project term.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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Formation and Business of the Company - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Oct. 16, 2018	Jun. 01, 2016	Jul. 31, 2016	Dec. 31, 2019	Dec. 31, 2018
Grant [Line Items]
Revenue from product development award				$ 4,753,000	$ 1,371,000
Common Stock [Member]
Grant [Line Items]
Reverse stock split ratio	1-for-6
Cancer Prevention & Research Institute of Texas [Member]
Grant [Line Items]
Revenue from product development award			$ 20,000,000
Grant termination date		Nov. 30, 2019
Percentage of cash required to raise in matching funds		50.00%
Cash required to raise in matching funds		$ 10,000,000
Term of project during which cash required to raise in matching funds		3 years
Cash required in matching funds raised		$ 10,000,000
Percentage of grant award proceeds required to pay		400.00%
Cancer Prevention & Research Institute of Texas [Member] \| Maximum [Member]
Grant [Line Items]
Percentage of grant award proceeds required to pay thereafter until government exclusivity maintained		1.00%
Stanford University [Member] \| Maximum [Member]
Grant [Line Items]
Milestone payments upon achievement of clinical and regulatory milestones				$ 1,000,000