Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (41,055)	$ (37,923)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,315	4,171
Lease right-of-use asset amortization	475	395
Net book value of consigned equipment sold	63	94
Loss on disposal of property and equipment	861	30
Stock-based compensation	13,083	13,979
Credit loss (recovery) expense	(130)	171
Change in excess/obsolete inventory reserve	1,771	697
Amortization of discounts on investments	(6,242)	(7,120)
Changes in operating assets and liabilities:
Accounts receivable	1,226	5,226
Accounts receivable - TIA		1,912
Inventory	1,362	(4,534)
Prepaid expense and other current assets	293	(641)
Other assets	(1,213)	421
Accounts payable, accrued expenses and other	(1,883)	3,252
Operating lease liability	(709)	(133)
Deferred revenue	182	(1,644)
Other liabilities	(9)	(39)
Net cash used in operating activities	(27,610)	(21,686)
Cash flows from investing activities:
Purchases of investments	(150,857)	(255,095)
Maturities of investments	159,440	313,770
Purchases of property and equipment	(1,651)	(3,700)
Proceeds from sale of equipment		9
Net cash provided by investing activities	6,932	54,984
Cash flows from financing activities:
Proceeds from exercise of stock options	1,597	1,874
Proceeds from issuance of common stock under employee stock purchase plan	459	269
Net cash provided by financing activities	2,056	2,143
Net (decrease) increase in cash and cash equivalents	(18,622)	35,441
Cash and cash equivalents, beginning of period	46,506	11,065
Cash and cash equivalents, end of period	27,884	46,506
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment purchases included in accounts payable and accrued expenses	$ 97	566
Right-of-use assets obtained in exchange for lease liabilities		$ 1,782