Income Taxes Deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. Federal and State net operating loss carryforwards	$ 143,126	$ 182,557
Foreign net operating loss carryforwards	4,096	1,524
Research and development tax credits	16,364	18,507
Share-based compensation	4,774	4,824
Intangible Assets	38,710	36,217
Interest expense carryforward	3,893	6,555
Deferred Revenue	47,456
Lease Liability	2,002
Other	3,974	4,882
Total deferred tax assets	264,395	255,066
Less: valuation allowance	(262,228)	(254,315)
Net deferred tax assets	2,167	751
Foreign intangible assets	(1,009)	(1,063)
Right of use asset	(1,599)
Other	(165)	(406)
Deferred tax liabilities	(2,773)	(1,469)
Net deferred tax liability	$ (606)	$ (718)