CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net income (loss)	$ (9,485)	$ 108,175
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation	1,107	1,515
Warrant liability revaluation gain		(6,983)
Future tranche right liability revaluation gain		(118,803)
Issuance of common stock for services rendered	44	130
Accretion of discounts on short-term investments		(1)
Depreciation and amortization expense	8	11
Changes in operating assets and liabilities:
Prepaid expenses and other assets	382	742
Accounts payable, accrued expenses, and other liabilities	(150)	(640)
Other	1	4
Net cash used in operating activities	(8,093)	(15,850)
Cash Flows from Investing Activities:
Proceeds from maturity of available-for-sale securities		4,500
Net cash provided by investing activities		4,500
Cash Flows from Financing Activities:
Proceeds from common stock financings, net		18,841
Proceeds from employee stock purchases	28	34
Proceeds from exercise of common stock options and warrants		271
Payments on seller-financed purchases		(435)
Net cash provided by financing activities	28	18,711
Net increase (decrease) in cash and cash equivalents	(8,065)	7,361
Cash and cash equivalent, beginning of period	32,545	33,229
Cash and cash equivalents, end of period	24,480	40,590
Supplemental disclosure of cash flow information:
Cash paid for interest		5
Supplemental disclosure of non-cash financing and investing activities:
Offering costs in accounts payable and accrued expenses	$ 15	$ 68