Summary of Significant Accounting Policies - Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Medical Indication Information
Net sales	$ 172,794	$ 174,386	$ 521,566	$ 513,652
Segment information
Number of reportable segments | segment			1
Antibiotic
Medical Indication Information
Net sales	3,789	3,801	$ 12,066	10,701
Anti-Psychosis
Medical Indication Information
Net sales	20,616	9,336	45,540	47,127
Cardiovascular
Medical Indication Information
Net sales	22,783	18,514	70,233	39,955
Central Nervous System
Medical Indication Information
Net sales	9,424	8,395	22,808	24,137
Gallstone
Medical Indication Information
Net sales	3,041	3,828	7,744	15,674
Gastrointestinal
Medical Indication Information
Net sales	11,735	16,562	36,783	46,171
Glaucoma
Medical Indication Information
Net sales	659	875	1,719	5,706
Migraine
Medical Indication Information
Net sales	9,846	12,888	32,134	43,387
Muscle Relaxant
Medical Indication Information
Net sales	3,238	3,299	9,538	10,309
Pain Management
Medical Indication Information
Net sales	5,856	6,594	19,771	18,483
Respiratory
Medical Indication Information
Net sales	498	2,324	2,676	6,200
Thyroid Deficiency
Medical Indication Information
Net sales	55,210	69,975	197,564	185,983
Urinary
Medical Indication Information
Net sales	2,105	33	5,262	5,870
Other
Medical Indication Information
Net sales	16,062	12,376	37,230	38,178
Contract manufacturing revenue
Medical Indication Information
Net sales	$ 7,932	$ 5,586	$ 20,498	$ 15,771