Stockholder's Equity Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment	$ 1,112	$ 860	$ 3,019	$ 2,452
Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment	69	40	171	122
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment	221	177	589	496
Sales, marketing and support
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment	226	138	620	485
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment	$ 596	$ 505	$ 1,639	$ 1,349