Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Long-Term Liabilities
Deferred Rent	$ 669	$ 398
Net Deferred Tax Liabilities related to IPR&D	22,854	28,054
Deferred Income from Sale of Tax Benefits	8,940	9,436
Accrued Lease Restructuring	854	1,154
Long-Term Severance	100	539
Contingent Milestones	44,000	44,200
Deferred Revenue	3,726	3,749
Total	81,143	87,530
Less Current Portion	(5,792)	(4,826)
Long-Term Portion	$ 75,351	$ 82,704