Summary of Significant Accounting Policies - Segment Information (Details) $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Medical Indication Information
Total net sales	$ 137,920	$ 144,372	$ 136,110	$ 127,342	$ 133,841	$ 172,794	$ 193,718	$ 155,054	$ 170,911	$ 174,386	$ 184,305	$ 154,961	$ 545,744	$ 655,407	$ 684,563
Number of reportable segments | segment													1
Analgesic
Medical Indication Information
Total net sales													$ 8,680	8,251	3,809
Anti-Psychosis
Medical Indication Information
Total net sales													104,934	73,453	59,557
Cardiovascular
Medical Indication Information
Total net sales													88,576	101,467	64,011
Central Nervous System
Medical Indication Information
Total net sales													77,256	59,019	59,672
Endocrinology
Medical Indication Information
Total net sales														197,522	245,929
Gastrointestinal
Medical Indication Information
Total net sales													73,477	63,043	67,762
Infectious Disease
Medical Indication Information
Total net sales													73,237	16,950	17,685
Migraine
Medical Indication Information
Total net sales													44,266	41,592	54,015
Respiratory/Allergy/Cough/Cold
Medical Indication Information
Total net sales													11,576	12,479	25,284
Urinary
Medical Indication Information
Total net sales													4,225	6,755	8,068
Other
Medical Indication Information
Total net sales													35,013	51,517	58,936
Contract manufacturing revenue
Medical Indication Information
Total net sales													$ 24,504	$ 23,359	$ 19,835