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Collaborative Research, Development, and License Agreements - Additional Information (Detail) - USD ($)	1 Months Ended			12 Months Ended
	May 31, 2018	Sep. 30, 2017	Apr. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				$ 3,091,000	$ 4,603,000
Non-exclusive patent license agreement annual fee				482,000	1,030,000
April 2017 Non-exclusive Research Affiliation Collaborative [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Non-exclusive patent license agreement term			2 years
Proceeds from Non-exclusive patent annual license fee	$ 75,000		$ 75,000
Collaborations and Licenses [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				171,000	422,000
Collaborations and Licenses [Member] \| April 2015 Research Collaboration Agreement [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				0	150,000
Collaborations and Licenses [Member] \| June 2016 Non-exclusive Research Affiliation Collaborative [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				0	65,000
Collaborations and Licenses [Member] \| December 2016 Non-exclusive Research Affiliation Collaborative [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				39,000	39,000
Collaborations and Licenses [Member] \| April 2017 Non-exclusive Research Affiliation Collaborative [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				75,000	75,000
Collaborations and Licenses [Member] \| April 2017 Non-exclusive Research Affiliation Collaborative [Member] \| Up-front Payment Received [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues				57,000	43,000
Collaborations and Licenses [Member] \| September 2017 Agreement [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Total Revenues		$ 50,000		$ 0	$ 50,000
License [Member] \| April 2017 Non-exclusive Research Affiliation Collaborative [Member]
Collaborative Arrangements and Noncollaborative Arrangement Transactions [Line Items]
Non-exclusive patent license agreement annual fee			$ 75,000