Commitments - Exclusive License and Collaboration Agreement (Details) - USD ($)						3 Months Ended	6 Months Ended
	Apr. 19, 2018	Mar. 31, 2018	Mar. 16, 2017	Nov. 10, 2016	Nov. 19, 2015	Mar. 31, 2017	Jun. 30, 2018	Mar. 29, 2018	Jul. 31, 2016
Other Commitments [Line Items]
Market value of stock on measurement date (in dollars per share)								$ 19.18
Letter of Intent
Other Commitments [Line Items]
Stock newly-issued during the period (in shares)	37,866			14,327	14,327
Stock issued during the period			$ 83,300	$ 85,100	$ 120,300	$ 83,300	$ 776,000
Additional stock issued during the period, upon milestones (in shares)		37,866	10,745		92,634
Shares issued (in shares)									3,582
Obligatory stock issuance period			1 year
Share price of stock issued (in dollars per share)			$ 7.75
Royalty payments received, threshold for share issuance		$ 2,000,000
Net product sales milestone 1		30,000,000
Net product sales milestone 2		40,000,000
Net product sales milestone 3		55,000,000
Net product sales milestone 4		$ 75,000,000
Common stock, value, to be issued								$ 726,000
Research and Development Expense | Letter of Intent
Other Commitments [Line Items]
Stock issued during the period							726,000
Other Expense | Letter of Intent
Other Commitments [Line Items]
Stock issued during the period							$ 50,000