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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (12) $ (4,692)
Adjustments to reconcile net loss to net cash used in operating activities:    
Provision for doubtful accounts 280 120
Depreciation and amortization 3,461 3,567
Deferred income taxes 1 (5)
Loss on disposals of fixed assets 146 151
Compensation expense related to stock-based awards and employee stock purchase plan 296 881
Unrealized currency translation gain (1) (50)
Changes in operating assets and liabilities:    
Accounts receivable 776 (792)
Inventories (1,155) (1,026)
Prepaid expenses, other current assets, and current contract assets (141) (520)
Other non-current assets and non-current contract assets 267 626
Accounts payable (15,077) (7)
Contract liabilities and long-term contract liabilities 914 604
Accrued compensation, product warranty and other 3,466 (2,370)
Net cash used in operating activities (6,779) (3,513)
Cash flows from investing activities:    
Capital expenditures (2,103) (4,372)
Cash paid for acquisition of intangible asset (12) (14)
Purchases of marketable securities (16,010) (1)
Maturities and sales of marketable securities 15,422 4,500
Net cash (used in) provided by investing activities (2,703) 113
Cash flows from financing activities:    
Proceeds from stock options exercised and employee stock purchase plan 1,022 183
Purchase of treasury stock (239) 0
Payment of finance lease (22) (66)
Net cash provided by financing activities 761 117
Effect of exchange rate changes on cash and cash equivalents 40 (57)
Net decrease in cash and cash equivalents (8,681) (3,340)
Cash and cash equivalents at beginning of period 21,056 11,376
Cash and cash equivalents at end of period 12,375 8,036
Supplemental disclosure of non-cash investing and financing activities:    
Changes in accrued other and accounts payable related to property and equipment additions 119 46
Taxes accrued for net share settlement of options $ 0 $ 131