CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities:
Net income (loss)	$ (4,178)	$ 115,738
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation	545	1,111
Warrant liability revaluation gain		(6,983)
Future tranche right liability revaluation gain		(118,803)
Issuance of common stock for services rendered	22	67
Accretion of discounts on short-term investments		(1)
Depreciation and amortization expense	4	6
Changes in operating assets and liabilities:
Prepaid expenses and other assets	124	1,150
Accounts payable, accrued expenses, and other liabilities	(1,086)	(1,879)
Other	1	3
Net cash used in operating activities	(4,568)	(9,591)
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		16,322
Proceeds from employee stock purchases	16	28
Proceeds from exercise of common stock options and warrants		271
Payments on seller-financed purchases		(218)
Net cash provided by financing activities	16	16,403
Net increase (decrease) in cash and cash equivalents	(4,552)	11,312
Cash and cash equivalent, beginning of period	32,545	33,229
Cash and cash equivalents, end of period	27,993	44,541
Supplemental disclosure of cash flow information:
Cash paid for interest		3
Supplemental disclosure of non-cash financing and investing activities:
Offering costs in accounts payable and accrued expenses	$ 15	$ 61