STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net loss	$ (56,670)	$ (23,081)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,137	2,780
Issuance of common shares - Founders Agreement	1,033	901
Common shares issuable - Founders Agreement	6,598	4,617
Changes in operating assets and liabilities:
Prepaid expenses and other assets	828	(941)
Other receivables - related party	3	6
Accounts payable and accrued expenses	18,765	(833)
Net cash used in operating activities	(26,306)	(16,551)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock - Public offering	0	20,500
Offering costs for the issuance of common stock - Public offering	0	(1,660)
Proceeds from issuance of common stock - At-the-market offering	41,279	12,767
Offering costs for the issuance of common stock - At-the-market offering	(1,010)	(374)
Proceeds from the exercise of warrants	0	13
Net cash provided by financing activities	40,269	31,246
Net increase in cash and cash equivalents	13,963	14,695
Cash and cash equivalents at beginning of period	40,772	26,077
Cash and cash equivalents at end of period	54,735	40,772
Supplemental disclosure of noncash investing and financing activities:
Issuance of common shares - Founders Agreement	$ 4,617	$ 2,510