Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of all Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Carrying Value
Fair value measurement
Long term debt	$ 136,823	$ 131,077
Fair Value
Fair value measurement
Long term debt	144,855	132,437
Non-recurring basis | Carrying Value | Level 2 | 3.75% Convertible Notes
Fair value measurement
Long term debt	71,018	69,382
Non-recurring basis | Fair Value | Level 2 | 3.75% Convertible Notes
Fair value measurement
Long term debt	79,050	70,742
Term loan | Non-recurring basis | Carrying Value | Level 2
Fair value measurement
Long term debt	43,266	38,010
Term loan | Non-recurring basis | Fair Value | Level 2
Fair value measurement
Long term debt	43,266	38,010
Revolving Credit Facility | Non-recurring basis | Carrying Value | Level 2
Fair value measurement
Long term debt	22,539	23,685
Revolving Credit Facility | Non-recurring basis | Fair Value | Level 2
Fair value measurement
Long term debt	$ 22,539	$ 23,685