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Research Funding Agreement - Additional Information (Details) - USD ($)		3 Months Ended
	Mar. 06, 2018	Mar. 31, 2019	Mar. 31, 2018
Research And Development Arrangement Contract To Perform For Others [Line Items]
Amounts received for qualifying expenses incurred recorded as reduction of research and development expense		$ 500,000
Silverstein Foundation | Funding Agreement
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront sum of funding amount	$ 500,000
Qualifying expenses		$ 0	$ 0

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- Definition

Amount received for qualifying expenses incurred recorded as reduction of research and development expense.

+ References

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- Definition

The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 3
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