Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue	$ 523	$ 85	$ 3,425	$ 5,492
Operating expenses:
Research and development	5,114	3,707	6,656	7,536
General and administrative	3,896	1,375	5,886	3,401
Restructuring costs	39		103
Total operating expenses	9,049	5,082	12,645	10,937
Operating loss	(8,526)	(4,997)	(9,220)	(5,445)
Other income and (expenses):
Interest income	23	34	64	39
Interest expense		(97)		(204)
Non-cash interest expense related to sale of future royalties	(446)	(516)	(937)	(1,060)
Foreign exchange loss, net	(2)	(48)	(2)	(43)
Total other income and (expenses)	(425)	(627)	(875)	(1,268)
Net loss before income taxes	(8,951)	(5,624)	(10,095)	(6,713)
Provision for income taxes	26	13	179	263
Net loss	$ (8,977)	$ (5,637)	$ (10,274)	$ (6,976)
Net loss per share - basic and diluted (in dollars per share)	$ (0.12)	$ (0.39)	$ (0.15)	$ (0.64)
Shares used to compute net loss per share - basic and diluted (in shares)	74,675,131	14,597,446	67,676,138	10,969,473
Customer Service Contracts [Member]
Revenue:
Revenue	$ 92		$ 191
Royalty [Member]
Revenue:
Revenue	193	69	2,962	3,728
Non Cash Royalty Revenue [Member]
Revenue:
Revenue	$ 238	$ 16	$ 272	$ 1,764