Description of Business (Details Textual) - USD ($)	1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 31, 2018	Jun. 26, 2017	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Description of Business [Line Items]
Royalty Revenues From Sales Percentage			100.00%				80.00%	13.00%
Revenues			$ (280,000)		$ 151,000		$ (205,000)	$ 8,366,000
Proceeds from Royalties Received						$ 3,500,000
Payment Of Milestone Payments							7,000,000
Adjustments To Royalties Revenue									$ 313,000
Royalty Income, Nonoperating			54,000
Accounts Payable, Current			533,000				533,000		225,000
Over Paid Royalties							564,000	564,000
Royalty [Member]
Description of Business [Line Items]
Revenues			(280,000)		151,000		(205,000)	$ 8,366,000
Nektar Therapeutics, Inc [Member]
Description of Business [Line Items]
Revenues		$ 7,000,000			$ 7,000,000	$ 7,000,000	7,000,000
Proceeds from Royalties Received		3,500,000
Other Receivables, Net, Current		$ 3,500,000							3,500,000
Merck [Member]
Description of Business [Line Items]
Proceeds from Royalties Received	$ 88,000
Adjustments To Royalties Revenue			280,000				313,000		88,000
Accrued Royalties, Current After Offsetting									225,000
Accrued Royalties, Current	$ 313,000			$ 253,000					$ 313,000
Decreases Of Royalty Revenues			280,000
Royalty Income, Nonoperating			54,000
Royalty Expense			334,000
Accounts Payable, Current			$ 533,000				$ 533,000
Merck [Member] | Royalty [Member]
Description of Business [Line Items]
Revenues				$ 60,000