Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income (loss)	$ (203,989)	$ (39,075)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	459	387
Accretion of premiums and discounts on investments	0	(97)
Amortization of debt issuance costs	1,214	0
Non-cash interest expense related to the revenue interest liability	23,310	13,739
Stock-based compensation expense	19,832	21,712
Changes in assets and liabilities:
Accounts receivable	(9,322)	(5,787)
Prepaids and other assets	1,096	(2,202)
Deferred revenue	2,251	(490)
Inventories	(17,836)	(9,061)
Other long-term liabilities	0	1,710
Accounts payable	(30,833)	(11,326)
Other accrued liabilities	7,715	13,863
Net cash used in operating activities	(206,103)	(16,627)
Investing activities
Purchases of investments	0	(4,420)
Proceeds from sales/maturities of investments	0	39,145
Purchase of property and equipment	0	(693)
Net cash provided by investing activities	0	34,032
Financing activities
Proceeds from revenue interest liability, net of issuance costs	49,917	25,000
Proceeds from issuance of common stock, net of issuance costs	4,388	0
Proceeds from exercise of common stock options	3,211	6,395
Payments on revenue interest liability	(2,263)	(110)
Payment of debt issuance costs	(440)	0
Net cash provided by financing activities	54,813	31,285
Net (decrease) increase in cash and cash equivalents	(151,290)	48,690
Cash, cash equivalents and restricted cash at beginning of period	304,962	167,058
Cash, cash equivalents and restricted cash at end of period	153,672	215,748
Supplemental disclosure of cash flow information:
Common stock issuance costs not yet paid	181	0
Purchase of property and equipment not yet paid	0	148
Non cash right of use asset	$ 10	$ 3