Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenue from contract with customer	$ 6,129	$ 3,053	$ 9,875	$ 4,702
Treatment investment revenue	564	53	644	107
Grant and contract revenue	82	44	1,691	44
Total revenue	6,775	3,150	12,210	4,853
Operating expenses
General and administrative	3,731	2,857	7,427	5,822
Research and development	1,634	1,616	5,201	4,036
License fees	0	0	0	5,625
Total operating expenses	5,365	4,473	12,628	15,483
Income (loss) from operations	1,410	(1,323)	(418)	(10,630)
Other income (expense)
Interest income	122	6	244	11
Loss on settlement of liability	0	(50)	0	(50)
Loss on foreign exchange	(11)	(30)	(41)	(38)
Total other income (expense)	111	(74)	203	(77)
Income (loss) before income taxes	1,521	(1,397)	(215)	(10,707)
Income tax (expense) benefit	57	0	57	(33)
Net income (loss)	$ 1,578	$ (1,397)	$ (158)	$ (10,740)
Net income (loss) per share of common stock:
Basic (in dollars per share)	$ 0.39	$ (0.52)	$ (0.04)	$ (4.11)
Diluted (in dollars per share)	$ 0.31	$ (0.52)	$ (0.04)	$ (4.11)
Weighted average shares outstanding used to compute net income (loss) per share:
Basic (in shares)	3,995,669	2,679,910	3,952,773	2,611,245
Diluted (in shares)	5,128,575	2,679,910	3,952,773	2,611,245