Related Party Transactions (Details) $ in Thousands	3 Months Ended	6 Months Ended	8 Months Ended
	Sep. 30, 2018 shares	Jun. 30, 2018 USD ($) shares	Jan. 06, 2018 USD ($) shares	Jul. 01, 2018
Related Party Transaction [Line Items]
Professional and contract service expense | $			$ 555
Percent of stock-based compensation shares retired				0.50
Percent of stock-based compensation shares that continue to vest	0.50
M Rosenberg Bio Pharma Consulting LLC
Related Party Transaction [Line Items]
Professional and contract service expense | $		$ 347
Employee stock option
Related Party Transaction [Line Items]
Non-qualifed stock options granted (in shares)	1,279,000
Employee stock option | Chief Technology Officer
Related Party Transaction [Line Items]
Stock issued during period, net of forfeitures (in shares)		104,389
Employee stock option | M Rosenberg Bio Pharma Consulting LLC
Related Party Transaction [Line Items]
Non-qualifed stock options granted (in shares)			45,000