Summary of Significant Accounting Policies - Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Medical Indication Information
Net sales	$ 193,718	$ 184,305	$ 348,772	$ 339,266
Segment information
Number of reportable segments | segment			1
Antibiotic
Medical Indication Information
Net sales	4,187	3,552	$ 8,276	6,900
Anti-Psychosis
Medical Indication Information
Net sales	14,036	22,799	24,924	37,791
Cardiovascular
Medical Indication Information
Net sales	25,680	10,135	47,450	21,441
Central Nervous System
Medical Indication Information
Net sales	6,187	6,925	13,384	15,742
Gallstone
Medical Indication Information
Net sales	2,489	5,282	4,703	11,846
Gastrointestinal
Medical Indication Information
Net sales	10,009	15,055	25,048	29,608
Glaucoma
Medical Indication Information
Net sales	512	2,164	1,060	4,832
Migraine
Medical Indication Information
Net sales	12,551	15,484	22,288	30,499
Muscle Relaxant
Medical Indication Information
Net sales	3,121	3,219	6,300	7,010
Pain Management
Medical Indication Information
Net sales	8,968	6,128	13,915	11,889
Respiratory
Medical Indication Information
Net sales	1,163	2,230	2,178	3,876
Thyroid Deficiency
Medical Indication Information
Net sales	88,477	68,794	142,354	116,008
Urinary
Medical Indication Information
Net sales	1,606	2,840	3,158	5,837
Other
Medical Indication Information
Net sales	6,827	13,105	21,168	25,802
Contract manufacturing revenue
Medical Indication Information
Net sales	$ 7,905	$ 6,593	$ 12,566	$ 10,185