Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 7,485
Cost of revenues	897
Gross profit	6,588
Operating expenses:
Research and development expenses	10,513	$ 16,588
Selling, general and administrative expenses	22,189	21,973
Operating loss	(26,114)	(38,561)
Interest and other income, net	179	768
Net Loss	(25,935)	(37,793)
Statements of Comprehensive Loss
Net loss	(25,935)	(37,793)
Other comprehensive income
Unrealized (loss) gain on marketable securities	(128)	35
Comprehensive Loss	$ (26,063)	$ (37,758)
Net loss per ordinary share basic and diluted	$ (1.17)	$ (1.79)
Weighted average number of shares outstanding used in computation of basic and diluted loss per ordinary share	22,242,375	21,158,161