Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (61,719)	$ (56,731)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	81	153
Amortization of premiums and discounts on investments	(339)	173
Amortization of debt issuance costs	417	398
Non-cash interest expense related to the revenue interest liability	11,320	11,015
Stock-based compensation expense	2,903	4,436
Changes in assets and liabilities:
Accounts receivable	(2,686)	(2,182)
Prepaids and other assets	(1,608)	764
Deferred revenue	8,650	(2,100)
Inventories	(4,151)	(1,260)
Accounts payable	(5,975)	9,393
Other accrued liabilities	(1,249)	(3,049)
Net cash used in operating activities	(54,356)	(38,990)
Investing activities
Purchases of investments	0	(18,102)
Proceeds from sales/maturities of investments	25,000	0
Net cash provided by (used in) investing activities	25,000	(18,102)
Financing activities
Payments on revenue interest liability	(3,106)	(1,217)
Proceeds from issuance of common stock, net of issuance costs	52,598	0
Payment of issuance costs	0	(219)
Net cash provided by (used in) financing activities	49,492	(1,436)
Net increase (decrease) in cash and cash equivalents	20,136	(58,528)
Cash, cash equivalents and restricted cash at beginning of period	124,775	258,892
Cash, cash equivalents and restricted cash at end of period	144,911	200,364
Supplemental disclosure of cash flow information:
Common stock issuance, warrant, and pre-funded warrant issuance costs not yet paid	170	0
Non cash right of use asset	$ 1	$ 6