Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net (loss) income	$ (3,163)	$ 367
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for credit losses	54	280
Depreciation and amortization	3,247	3,461
Deferred income taxes	36	1
Loss on disposals of fixed assets	683	146
Compensation expense related to stock-based awards and employee stock purchase plan	522	296
Unrealized currency translation loss (gain)	241	(1)
Changes in operating assets and liabilities:
Accounts receivable	(355)	776
Inventories	(44)	(1,155)
Prepaid expenses and other current assets	100	(111)
Other non-current assets	328	312
Accounts payable	2,184	(15,077)
Deferred revenue	400	460
Accrued compensation, product warranty and other	(5,025)	3,466
Net cash used in operating activities	(792)	(6,779)
Cash flows from investing activities:
Capital expenditures	(2,399)	(2,103)
Cash paid for acquisition of intangible asset	(10)	(12)
Purchases of marketable securities	(720)	(16,010)
Maturities and sales of marketable securities	4,000	15,422
Net cash provided by (used in) investing activities	871	(2,703)
Cash flows from financing activities:
Proceeds from stock options exercised and employee stock purchase plan	96	1,022
Purchase of treasury stock	0	(239)
Payment of finance lease	0	(22)
Net cash provided by financing activities	96	761
Effect of exchange rate changes on cash and cash equivalents	(28)	40
Net increase (decrease) in cash and cash equivalents	147	(8,681)
Cash and cash equivalents at beginning of period	11,294	21,056
Cash and cash equivalents at end of period	11,441	12,375
Supplemental disclosure of non-cash investing and financing activities:
Changes in accrued other and accounts payable related to property and equipment additions	$ 5	$ 119