Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Beginning balance at Dec. 31, 2021	$ 264	$ 393,644	$ (308,733)	$ 85,175
Beginning balance, shares at Dec. 31, 2021	26,395
Share-based awards and options exercises	$ 3	6		9
Share-based awards and options exercises, shares	322
Share-based compensation expense		2,252		2,252
Net Loss			(10,838)	(10,838)
Ending balance at Mar. 31, 2022	$ 267	395,902	(319,571)	76,598
Ending balance, shares at Mar. 31, 2022	26,717
Beginning balance at Dec. 31, 2021	$ 264	393,644	(308,733)	85,175
Beginning balance, shares at Dec. 31, 2021	26,395
Net Loss				(21,260)
Ending balance at Jun. 30, 2022	$ 268	398,147	(329,993)	68,422
Ending balance, shares at Jun. 30, 2022	26,856
Beginning balance at Mar. 31, 2022	$ 267	395,902	(319,571)	76,598
Beginning balance, shares at Mar. 31, 2022	26,717
Share-based awards and options exercises	$ 1	42		43
Share-based awards and options exercises, shares	139
Share-based compensation expense		2,203		2,203
Net Loss			(10,422)	(10,422)
Ending balance at Jun. 30, 2022	$ 268	398,147	(329,993)	68,422
Ending balance, shares at Jun. 30, 2022	26,856
Beginning balance at Dec. 31, 2022	$ 273	402,679	(345,892)	57,060
Beginning balance, shares at Dec. 31, 2022	27,268
Share-based awards and options exercises	$ 12	(12)
Share-based awards and options exercises, shares	1,197
Share-based compensation expense		1,805		1,805
Net Loss			(10,520)	(10,520)
Ending balance at Mar. 31, 2023	$ 285	404,472	(356,412)	48,345
Ending balance, shares at Mar. 31, 2023	28,465
Beginning balance at Dec. 31, 2022	$ 273	402,679	(345,892)	57,060
Beginning balance, shares at Dec. 31, 2022	27,268
Net Loss				(15,421)
Ending balance at Jun. 30, 2023	$ 288	406,502	(361,313)	45,477
Ending balance, shares at Jun. 30, 2023	28,813
Beginning balance at Mar. 31, 2023	$ 285	404,472	(356,412)	48,345
Beginning balance, shares at Mar. 31, 2023	28,465
Share-based awards and options exercises	$ 3	(3)
Share-based awards and options exercises, shares	348
Share-based compensation expense		2,033		2,033
Net Loss			(4,901)	(4,901)
Ending balance at Jun. 30, 2023	$ 288	$ 406,502	$ (361,313)	$ 45,477
Ending balance, shares at Jun. 30, 2023	28,813