Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenue	$ 1,755	$ 1,273
Expenses:
Research and development	1,893	6,737
Selling, general and administrative	10,668	13,314
Total expenses	14,019	20,313
Loss from operations	(12,264)	(19,040)
Other income and expenses
Other income	71
Interest income	69	507
Interest expense		(955)
Net loss	$ (12,124)	$ (19,488)
Net loss per share-basic and diluted	$ (1.31)	$ (7.25)
Weighted-average number of common shares used in net loss per share-basic and diluted	9,273	2,687
Comprehensive loss	$ (12,124)	$ (19,488)
Product Revenue, net [Member]
Revenues:
Total revenue	1,755	341
Expenses:
Cost of revenue	1,360	164
Government Revenue [Member]
Revenues:
Total revenue		932
Intangible asset amortization [Member]
Expenses:
Cost of revenue	$ 98	$ 98