Long-Term Obligations and Commitments, Research and Development and Manufacturing Facilities (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Research and Development and Manufacturing Facilities [Abstract]
Loss on extinguishment of financing liability for leased facility			$ 0	$ 0	$ (7,689)
Long-term Mortgage Debt [Member]
Research and Development and Manufacturing Facilities [Abstract]
Face amount	$ 60,400
Primary R&D Facility [Member]
Research and Development and Manufacturing Facilities [Abstract]
Payment to acquire building	$ 79,400
Interest rate	3.88%
Period to make interest only payments on mortgage loan			5 years
Loss on extinguishment of financing liability for leased facility		$ (7,700)
Manufacturing Facility [Member]
Research and Development and Manufacturing Facilities [Abstract]
Payment to acquire building	$ 14,000
Interest rate	4.20%
Period to make interest only payments on mortgage loan			5 years