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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows From Operating Activities:    
Net loss $ (5,574) $ (13,404)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 6,404 5,365
Amortization of debt discount 641 643
Non-cash operating lease expense 1,099 896
Unrealized (gain) loss on investments in equity securities (1,510) 4,908
Realized (gain) loss on available-for-sale investments 86 49
Stock-based compensation expense 5,184 4,125
Loss on disposal of property and equipment 77 92
Gain on insurance settlement (2,642)  
Change in credit losses (103) 31
Insurance proceeds for operations 1,212 3,000
Change in contingent consideration 46  
Changes in operating assets and liabilities:    
Accounts receivable (1,414) 3,340
Inventories 1,239 (7,715)
Prepaid expenses and other current assets (271) 21
Deposits (198)  
Operating lease liabilities (1,004) (891)
Accounts payable and other accrued expenses (3,276) (2,107)
Accrued compensation and related expenses 1,962 2,141
Deferred revenue 570 (30)
Net deferred tax liability 246 60
Net cash provided by operating activities 2,774 524
Cash Flows From Investing Activities:    
Purchases of property and equipment (9,569) (4,245)
Insurance proceeds for loss of fixed assets 976 2,000
Software development costs (463) (213)
Purchases of short-term investments   (30,354)
Sales/maturities of short-term investments 7,850 36,000
Patent and trademark costs (177) (138)
Net cash provided by (used in) investing activities (1,383) 3,050
Cash Flows From Financing Activities:    
Proceeds from exercise of stock options 92 313
Repurchase of common stock   (8,349)
Repayment of notes payable 10  
Repayment of finance lease liabilities (31) (13)
Net cash provided by (used in) financing activities 71 (8,049)
Effect of exchange rates on cash and cash equivalents 481 (178)
Net change in cash and cash equivalents 1,943 (4,653)
Cash and cash equivalents - beginning of period 36,595 139,101
Cash and cash equivalents - end of period 38,538 134,448
Supplemental Disclosure of Cash Flow Information:    
Cash paid for income taxes 433 32
Supplemental Disclosure of Non-Cash Financing Activities:    
Operating lease right-of-use assets and operating lease liabilities 4,436  
Net unrealized (gain) loss on available-for-sale debt securities (3,675) 14,065
Reclassification of realized loss on available-for-sale debt securities to earnings 99 33
Paid-in-kind preferred stock dividend, including beneficial conversion feature 2,000 2,000
Fixed assets included in accounts payable and accrued liabilities $ 707 $ 549