Summary of Significant Accounting Policies - Inventory (Details)	6 Months Ended	12 Months Ended			24 Months Ended
	Dec. 31, 2016 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2016 USD ($)
Inventory
Raw materials	$ 357,000	$ 317,000	$ 279,000		$ 317,000
Work in process	1,835,000	590,000	2,656,000		590,000
Total	$ 2,192,000	907,000	2,935,000		907,000
Number of suppliers | item	2
Raw materials inventory write-downs	$ 1,100,000				$ 1,400,000
Minimum supply period of raw materials that is not supported by firm, fixed orders and/or projections from collaborators considered to expense inventory	12 months
Rolling period of firm, fixed orders for conjugate that the company is required to manufacture	6 months
Rolling period of manufacturing projections for the quantity of conjugate the collaborator expects to need	12 months
Maximum period of firm, fixed orders and/or projections from collaborators considered for capitalizing inventory	12 months
Charges to research and development expense related to raw material inventory identified as excess	$ 150,000	$ 1,100,000	$ 1,000,000	$ 364,000
Unbilled Revenue	$ 5,000,000