Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 150,727	$ 57,181
Research credit carryforwards	14,843	31,101
Fixed assets and intangibles	419	1,637
Accrued expenses	171	657
Deferred revenue	0	957
Other	17,960	11,430
Deferred tax assets	184,120	102,963
Valuation allowance for deferred tax assets	(141,338)	(4,476)
Net deferred tax assets	42,782	98,487
Deferred tax liabilities:
Retrophin fair value adjustment	(18)	(179)
Convertible debt	0	(2,905)
Identified intangibles	(41,664)	(44,643)
Identified indefinite lived intangibles	(1,040)	(1,759)
Investment in Viking	(2,937)	(2,480)
Deferred revenue	(3,488)	0
Other	(964)	0
Net deferred tax liabilities	(50,111)	(51,966)
Deferred income taxes, net	$ (7,329)
Deferred income taxes, net		$ 46,521