CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net loss	$ (38,669)	$ (34,730)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	131	157
Amortization of debt issuance costs	609	480
Accretion of revenue interest financing debt, net of cash paid	1,065	1,440
Amortization of discount on short-term investments	(149)	(228)
Stock-based compensation expense	5,193	3,741
Amortization of net contract asset/liability	(337)	(413)
Noncash lease expense	47	53
Noncash lease liability	224	96
Write off of fixed assets		62
Changes in operating assets and liabilities:
Net contract asset/liability	522	544
Prepaid expenses and other current assets, non-current assets, inventory and accounts receivable	(3,833)	(8,963)
Accounts payable and accrued expenses	(2,264)	(3,717)
Net cash used in operating activities	(37,461)	(41,478)
Cash flows from investing activities
Maturities of short-term investments	20,885
Purchases of short-term investments		(51,995)
Net cash provided by (used in) investing activities	20,885	(51,995)
Cash flows from financing activities
Proceeds from exercise of stock options	257
Other cash flows from financing activities		(174)
Net cash provided by (used in) financing activities	257	(174)
Net decrease in cash and cash equivalents	(16,319)	(93,647)
Cash and cash equivalents-beginning of period	120,572	240,551
Cash and cash equivalents-end of period	104,253	146,904
Supplemental disclosure of cash flow information
Unrealized gain on short-term investments	20	74
Cash paid for interest during the period	$ 2,671	$ 2,156