Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities
Net loss	$ (26,095)	$ (28,595)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	274	378
Accretion of debt discount and debt issuance costs	465	168
Stock-based compensation expense	8,085	8,823
Allowance for credit losses	61	104
Provision (benefit) for excess and obsolete inventories	(24)	(91)
Noncash operating lease expense	241	325
Noncash loss on debt extinguishment	0	1,033
Changes in operating assets and liabilities:
Accounts receivable	1,112	(5,734)
Inventory	135	1,159
Prepaid expenses and other current assets	201	1,151
Other noncurrent assets	73	(49)
Accounts payable	385	627
Accrued compensation	(4,453)	866
Accrued and other current liabilities	392	1,909
Other noncurrent liabilities	0	(1,328)
Net cash used in operating activities	(19,148)	(19,254)
Cash flows from investing activities
Purchases of property and equipment	(210)	(197)
Net cash used in investing activities	(210)	(197)
Cash flows from financing activities
Net proceeds from Hercules Loan Agreement	0	34,526
Repayment of Prior Loan Agreement	0	(35,375)
Debt issuance costs	0	(238)
Proceeds from employee stock purchase plan purchases	434	450
Taxes paid on net share settlement of restricted stock units	(54)	(20)
Proceeds from exercise of common stock options	121	156
Net cash provided by (used in) financing activities	501	(501)
Net change in cash and cash equivalents	(18,857)	(19,952)
Cash and cash equivalents at beginning of period	120,357	138,129
Cash and cash equivalents at end of period	101,500	118,177
Supplemental disclosure of cash flow information
Cash paid for interest	2,082	2,024
Supplemental noncash disclosure of investing and financing activities
Acquisition of property and equipment included in accounts payable and accrued liabilities	23	0
Common stock warrants issued upon execution of Hercules Loan Agreement	$ 0	$ 609