CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Allowances for doubtful accounts	$ 0	$ 0	$ 9
Accumulated depreciation	$ 4,316	$ 30,858	$ 29,561
Preferred stock, par value (in USD per share)	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000
Common stock, par value (in USD per share)	$ 0.10	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	250,000,000	250,000,000	250,000,000
Common stock, shares issued (in shares)	190,411,070	186,801,159	110,334,643
Common stock, shares outstanding (in shares)	190,411,070	186,801,159	110,309,918
Treasury stock, shares (in shares)	34,725	34,725	34,725
Convertible preferred stock
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0	1,000,000
Preferred stock, shares outstanding (in shares)	0	0	1,000,000