Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Timing of revenue recognition:	Timing of revenue recognition	Timing of revenue recognition:	Timing of revenue recognition:	Timing of revenue recognition:
Disaggregated revenue	$ 746	$ 587	$ 1,225	$ 2,056
Product Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue				1,247
License And Royalty Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	746	572	1,225	784
Contract Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue		15		25
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	746	572	1,225	2,035
Transferred at Point in Time [Member] | Product Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue				1,247
Transferred at Point in Time [Member] | License And Royalty Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	746	572	1,225	784
Transferred at Point in Time [Member] | Contract Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue				4
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue		15		21
Transferred over Time [Member] | Product Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue
Transferred over Time [Member] | License And Royalty Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue
Transferred over Time [Member] | Contract Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue		$ 15		$ 21