Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregated revenue	$ 639	$ 1,190	$ 2,695	$ 4,281
Product revenue
Disaggregated revenue	100	999	1,347	1,198
License and Royalty revenue
Disaggregated revenue	539	17	1,323	17
Contract revenue
Disaggregated revenue	0	174	25	3,066
Transferred at Point in Time
Disaggregated revenue	639	1,137	2,674	1,388
Transferred at Point in Time | Product revenue
Disaggregated revenue	100	999	1,347	1,198
Transferred at Point in Time | License and royalty revenue
Disaggregated revenue	539	17		17
Transferred at Point in Time | License and Royalty revenue
Disaggregated revenue			1,323
Transferred at Point in Time | Contract revenue
Disaggregated revenue	0	121	4	173
Transferred over Time
Disaggregated revenue	0	53	21	2,893
Transferred over Time | Product revenue
Disaggregated revenue	0	0	0	0
Transferred over Time | License and royalty revenue
Disaggregated revenue	0	0		0
Transferred over Time | License and Royalty revenue
Disaggregated revenue			0
Transferred over Time | Contract revenue
Disaggregated revenue	$ 0	$ 53	$ 21	$ 2,893