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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (35,034) $ (30,458)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 3,268 3,258
Lease right-of-use asset amortization 587 353
Net book value of consigned equipment sold 70 35
Loss on disposal of property and equipment 132 462
Stock-based compensation 8,507 9,949
Credit loss expense (recovery) 29 (130)
Change in excess/obsolete inventory reserve 525 834
Amortization of discounts on investments (2,219) (5,052)
Changes in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable (3,649) 1,348
Inventory 647 835
Prepaid expense and other current assets 744 (225)
Other assets (924) (732)
Accounts payable, accrued expenses and other (3,338) (1,420)
Operating lease liability (939) (424)
Deferred revenue (80) 1,584
Other liabilities (47) (6)
Net cash used in operating activities (31,721) (19,789)
Cash flows from investing activities:    
Purchases of investments (98,031) (118,339)
Maturities of investments 117,600 128,440
Purchases of property and equipment (1,537) (1,504)
Acquisition of business, net of cash acquired of $541 (1,773)  
Net cash provided by investing activities 16,259 8,597
Cash flows from financing activities:    
Proceeds from exercise of stock options 417 1,379
Proceeds from issuance of common stock under employee stock purchase plan 134 265
Net cash provided by financing activities 551 1,644
Net decrease in cash and cash equivalents (14,911) (9,548)
Cash and cash equivalents, beginning of period 27,884 46,506
Cash and cash equivalents, end of period 12,973 36,958
Supplemental disclosure of non-cash investing and financing activities:    
Property and equipment purchases included in accounts payable and accrued expenses $ 29 $ 35