Accounts Receivable (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 01, 2018	Dec. 13, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2017	Feb. 28, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable			$ 4,112,000		$ 4,112,000				$ 11,697,000
Percent of counterparty payable offset by guarantor								50.00%
Royalty guarantees commitments amount								$ 6,250,000
License fees			$ 0	$ 0	$ 5,625,000	$ 0
SWK Purchase Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Upfront purchase price received under purchase agreement		$ 13,750,000
Legal fees		40,000
Milestone payment receivable under purchase agreement		3,750,000
Percent of milestone payments due									90.00%
Accounts receivable	$ 5,600,000								$ 11,700,000
Proceeds From milestone payments	$ 6,100,000
Minimum | SWK Purchase Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Milestone amount, achieved in two consecutive fiscal quarters							$ 25,000,000
SWK Funding LLC | SWK Purchase Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Royalty and licensing revenue		$ 26,250,000
Percent received upon milestone payment		10.00%
Milestone period		6 years
Percent received upon milestone payment, without commercialization		5.00%
Percent received without milestone payment		7.86%
Percent received without milestone payment, without commercialization		3.93%
Percent of milestone payments due									10.00%
SWK Funding LLC | Maximum | SWK Purchase Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Royalty and licensing revenue		$ 20,625,000