Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (32,123,000)	$ (10,274,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,989,000	1,193,000
Accretion of premium on investments	24,000	0
Stock-based compensation	3,855,000	2,956,000
Non-cash interest expense related to sale of future royalties	800,000	937,000
Non-cash revenue related to sale of future royalties	(802,000)	(2,800,000)
Change in operating assets and liabilities:
Accounts receivable	227,000	3,392,000
Prepaid expenses and other assets	(3,473,000)	(657,000)
Accounts payable	1,348,000	148,000
Other accrued liabilities	(1,596,000)	1,376,000
Net cash used in operating activities	(29,751,000)	(3,729,000)
Cash flows from investing activities:
Purchase of property and equipment	(2,818,000)	(13,000)
Proceeds from sale of equipment	0	3,000
Purchases of investments	(34,890,000)	0
Proceeds from maturities of investments	1,200,000	0
Net cash used in investing activities	(36,508,000)	(10,000)
Cash flows from financing activities:
Proceeds from issuance of common stock upon exercise of common stock warrants	1,849,000	24,658,000
Proceeds from issuance of common stock upon exercise of stock options	892,000	116,000
Disgorgement of short-swing profits, net of costs	0	652,000
Net cash provided by financing activities	104,655,000	34,601,000
Net increase in cash and cash equivalents	38,396,000	30,862,000
Cash and cash equivalents at beginning of the period	126,870,000	13,526,000
Cash and cash equivalents at end of the period	165,266,000	44,388,000
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	56,000	0
Lease-related assets and liabilities derecognized on early termination and modification of leases	158,000	0
Acquisition of property and equipment included in accounts payable and accrued expenses	314,000	170,000
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	$ 101,914,000	$ 0