Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net revenue
Total net revenue	$ 6,257	$ 5,870
Cost of revenue
Total cost of revenue	4,206	4,165
Gross profit	2,051	1,705
Operating expenses
Selling, general and administrative	30,435	14,947
Research and development	2,776	4,518
Total operating expenses	33,211	19,465
Operating loss	(31,160)	(17,760)
Other income (expense)
Interest income	352
Interest expense	(14)	(4)
Total other income (expense)	338	(4)
Loss before income tax expense	(30,822)	(17,764)
Income tax expense	10	1
Net loss	$ (30,832)	$ (17,765)
Basic and diluted net loss per share	$ (3.34)	$ (2.35)
Basic and diluted weighted average common shares outstanding	9,230	7,545
Product Sales [Member]
Net revenue
Total net revenue	$ 3,159	$ 3,067
Cost of revenue
Total cost of revenue	2,652	2,854
Service and Other [Member]
Net revenue
Total net revenue	3,098	2,803
Cost of revenue
Total cost of revenue	$ 1,554	$ 1,311