Net Loss Per Common Share - Schedule of all potentially dilutive securities excluded from the computation of basic and diluted net income (loss) per common share - Parenthetical (Details)	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Feb. 28, 2013
3.50% Convertible Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Interest rate (as a percent)	3.50%	3.50%	3.50%	3.50%