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CO-DEVELOPMENT AND LICENSE AGREEMENT - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions				3 Months Ended		12 Months Ended
	Aug. 29, 2017	Jul. 06, 2016	Jul. 07, 2014	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Co-development and license agreement
Research and development expense				$ 11,606,197	$ 8,449,267
Phase 3 Insomnia Trail
Co-development and license agreement
Percentage of milestone payment on aggregate product development cost				40.00%
Janssen | Phase 3 Insomnia Trail
Co-development and license agreement
Milestone method payments				$ 40,000,000
Janssen | Seltorexant | Co-Development and License Agreement
Co-development and license agreement
Payment of license fee			$ 22,000,000
Payment of development costs		$ 3,500,000
Direct expenses incurred		$ 300,000
Research and development expense				$ 0	$ 0
Janssen | Seltorexant | Amendment to Co-Development and License Agreement
Co-development and license agreement
Upfront payment	$ 30,000,000
Revenue recognition, milestone method, factors				The $30 million payment and $11.2 million in previously accrued collaborative expenses, which were forgiven upon the effective date of the Amendment, are earned and recognized as revenue as the services are performed from the commencement of Phase 3 development to the completion of the development activities using the proportional performance method.
Accrued collaborative expenses	11,200,000
Upfront payment received				$ 30,000,000		$ 30,000,000
Previously accrued collaborative expenses recognized as revenue				$ 11,200,000		$ 11,200,000
Janssen | Seltorexant | Amendment to Co-Development and License Agreement | Phase 3 Insomnia Trail
Co-development and license agreement
Payment start of Phase	20,000,000
Payment upon enrollment of patients	$ 20,000,000
Percentage of patients to be enrolled	50.00%
Johnson & Johnson Innovation-JJDC Inc
Co-development and license agreement
Stock repurchased	3.9
Stock repurchased price per share	$ 0.0001
Aggregate purchase price	$ 389

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