Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Product sales, net	$ 677
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales:
Cost of product sales	$ 236
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 441
Operating expenses:
Research and development	2,681	$ 2,552
Selling, general and administrative	4,581	2,165
Total operating expenses	7,262	4,717
Operating loss	(6,821)	(4,717)
Other income (expense):
Other income	11	59
Change in fair value of derivative financial instruments	8,289	2,525
Foreign exchange gain (loss)	(155)	968
Total other income	8,145	3,552
Net income (loss)	1,324	(1,165)
Other comprehensive income (loss):
Foreign currency translation adjustments	(112)	(953)
Comprehensive income (loss)	$ 1,212	$ (2,118)
Net income (loss) per share
Basic	$ 0.05	$ (0.06)
Diluted	$ (0.06)	$ (0.08)
Weighted average shares outstanding
Basic	25,832,190	20,334,929
Diluted	26,785,708	20,460,656