Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (16,007,000)	$ (1,297,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	996,000	580,000
Stock-based compensation	1,251,000	96,000
Non-cash interest expense related to sale of future royalties	466,000	491,000
Non-cash revenue related to sale of future royalties	(334,000)	(2,769,000)
Change in operating assets and liabilities:
Accounts receivable	(366,000)	956,000
Prepaid expenses and other assets	(2,694,000)	(690,000)
Accounts payable	2,281,000	(55,000)
Other accrued liabilities	(2,185,000)	(520,000)
Net cash used in operating activities	(16,592,000)	(3,208,000)
Cash flows from investing activities:
Purchase of property and equipment	(615,000)	(4,000)
Proceeds from sale of equipment	0	3,000
Purchases of investments	(19,944,000)	0
Net cash used in investing activities	(20,559,000)	(1,000)
Cash flows from financing activities:
Proceeds from issuance of common stock upon exercise of common stock warrants	1,649,000	10,349,000
Proceeds from issuance of common stock upon exercise of stock options	231,000	18,000
Net cash provided by financing activities	67,592,000	19,542,000
Net increase in cash and cash equivalents	30,441,000	16,333,000
Cash and cash equivalents at beginning of the period	126,870,000	13,526,000
Cash and cash equivalents at end of the period	157,311,000	29,859,000
Supplemental disclosure of non-cash financing activity:
Issuance of warrants to placement agent’s representatives	0	453,000
Acquisition of property and equipment included in accounts payable and accrued expenses	303,000	0
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	$ 65,712,000	$ 0