Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregated revenue	$ 8,886	$ 17,607
Product revenue
Disaggregated revenue	5,345	0
License and royalty revenue
Disaggregated revenue	99	10,011
Contract Revenue
Disaggregated revenue	3,442	7,596
Transferred at Point in Time
Disaggregated revenue	5,622	10,200
Transferred at Point in Time | Product revenue
Disaggregated revenue	5,345	0
Transferred at Point in Time | License and royalty revenue
Disaggregated revenue	99	10,011
Transferred at Point in Time | Contract Revenue
Disaggregated revenue	178	189
Transferred over Time
Disaggregated revenue	3,264	7,407
Transferred over Time | Product revenue
Disaggregated revenue	0	0
Transferred over Time | License and royalty revenue
Disaggregated revenue	0	0
Transferred over Time | Contract Revenue
Disaggregated revenue	$ 3,264	$ 7,407