CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 6,662	$ 15,966	$ 14,769	$ 28,389
General and administrative	5,293	5,122	10,340	10,180
Loss from operations	(11,955)	(21,088)	(25,109)	(38,569)
Other income (expenses):
Interest income	71	6	85	25
Interest expense	(2,699)	(1,302)	(5,002)	(2,555)
Gain on disposal of assets	26	0	26	0
Foreign currency loss	(1)	(2)	(1)	(2)
Net loss	$ (14,558)	$ (22,386)	$ (30,001)	$ (41,101)
Net loss per share of common stock, basic	$ (0.54)	$ (0.88)	$ (1.12)	$ (1.63)
Net loss per share of common stock, diluted	$ (0.54)	$ (0.88)	$ (1.12)	$ (1.63)
Weighted-average shares of common stock outstanding, basic	26,821,303	25,401,046	26,785,540	25,195,763
Weighted-average shares of common stock outstanding, diluted	26,821,303	25,401,046	26,785,540	25,195,763