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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net (loss) income $ (5,539) $ 1,140
Adjustments to reconcile net loss to net cash used in operating activities:    
Provision for credit losses 138 (1)
Depreciation and amortization 6,985 6,920
Deferred income taxes 36 3
Loss on disposals of fixed assets 1,211 323
Compensation expense related to stock-based awards and employee stock purchase plan 1,244 874
Unrealized currency translation loss 208 19
Changes in operating assets and liabilities:    
Accounts receivable (1,801) 481
Inventories (3,669) (1,447)
Prepaid expenses and other current assets (14,867) 712
Other non-current assets 604 445
Accounts payable 4,841 (8,260)
Deferred revenue (182) 203
Accrued compensation, product warranty and other (4,666) (4,598)
Net cash used in operating activities (15,457) (3,186)
Cash flows from investing activities:    
Capital expenditures (5,105) (4,744)
Cash paid for acquisition of intangible asset (21) (23)
Purchases of marketable securities (1,426) (16,697)
Maturities and sales of marketable securities 21,000 15,422
Net cash provided by (used in) investing activities 14,448 (6,042)
Cash flows from financing activities:    
Proceeds from stock options exercised and employee stock purchase plan 96 2,367
Purchase of treasury stock 0 (239)
Payment of finance lease 0 (22)
Net cash provided by financing activities 96 2,106
Effect of exchange rate changes on cash and cash equivalents (24) 74
Net decrease in cash and cash equivalents (937) (7,048)
Cash and cash equivalents at beginning of period 11,294 21,056
Cash and cash equivalents at end of period 10,357 14,008
Supplemental disclosure of non-cash investing and financing activities:    
Changes in accrued other and accounts payable related to property and equipment additions $ 21 $ 47