Condensed Consolidated Statement of Operations and Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cost of product revenue, related party activity	$ 80	$ 36	$ 150	$ 158
Stock compensation expense in cost of goods sold	31	20	75	49
Stock compensation expense in research and development expenses	175	152	523	361
Stock compensation expense in selling, general and administrative expenses	1,564	1,657	3,940	2,862
Product revenue
Related party revenue	321	43	526	179
Service and other revenue
Related party revenue	31	34	73	100
Stock compensation expense in cost of goods sold	58	38	175	121
Collaboration and license revenue
Related party revenue	$ 0	$ 1,612	$ 0	$ 2,149