Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (17,583,000)	$ (8,085,000)	$ (49,706,000)	$ (18,359,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			3,010,000	1,846,000
Accretion of premium on investments			55,000	0
Stock-based compensation			5,954,000	3,871,000
Non-cash interest expense related to sale of future royalties	337,000	464,000	1,137,000	1,401,000
Non-cash revenue related to sale of future royalties			(908,000)	(3,027,000)
Change in operating assets and liabilities:
Accounts receivable			144,000	3,369,000
Prepaid expenses and other assets			(3,570,000)	(1,384,000)
Accounts payable			1,483,000	810,000
Other accrued liabilities			(1,617,000)	(1,511,000)
Net cash used in operating activities			(44,018,000)	(12,984,000)
Cash flows from investing activities:
Purchase of property and equipment			(4,142,000)	(321,000)
Proceeds from sale of equipment			0	3,000
Purchases of investments			(41,278,000)	0
Proceeds from maturities of investments			4,500,000	0
Net cash used in investing activities			(40,920,000)	(318,000)
Cash flows from financing activities:
Proceeds from issuance of common stock upon exercise of common stock warrants			1,849,000	25,951,000
Proceeds from issuance of common stock upon exercise of stock options			1,240,000	402,000
Disgorgement of short-swing profits, net of costs			0	652,000
Net cash provided by financing activities			125,299,000	133,214,000
Net increase in cash and cash equivalents			40,361,000	119,912,000
Cash and cash equivalents at beginning of the period			126,870,000	13,526,000	$ 133,438,000
Cash and cash equivalents at end of the period	$ 167,231,000	$ 133,438,000	167,231,000	133,438,000	$ 167,231,000
Supplemental disclosure of non-cash financing activity:
Issuance of warrants to placement agent’s representatives			0	453,000
Operating lease liabilities arising from obtaining right-of-use assets			6,939,000	1,022,000
Lease-related assets and liabilities derecognized on early termination and modification of leases			235,000	0
Acquisition of property and equipment included in accounts payable and accrued expenses			289,000	213,000
Registered Direct Offering [Member]
Cash flows from financing activities:
Net proceeds from issuance of common stock			0	9,175,000
ATM Program [Member]
Cash flows from financing activities:
Net proceeds from issuance of common stock			$ 122,210,000	$ 97,034,000