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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash Flows from Operating activities:      
Net loss $ (30,189) $ (37,159) $ (31,193)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 2,006 1,648 1,060
Allowance for credit losses 390 341 763
Inventory impairment 1,905    
Share-based compensation 7,319 8,746 7,869
Non-cash interest expense 634 709 715
Cost of rental units purchased by customers   92 203
Changes in certain assets and liabilities:      
Accounts receivable, net (8,831) (6,658) (3,817)
Inventory (1,098) (2,587) (3,444)
Net investments in sales-type leases 1,193 1,114 324
Prepaid commission expense (1,319) (1,243) (1,926)
Prepaid expenses and other assets (2,845) 786 62
Accounts payable 2,029 (1,968) 276
Accrued expenses (2,243) 6,604 910
Deferred revenue (989) (1,164) 215
Net Cash used in Operating activities (32,038) (30,739) (27,983)
Cash Flows from Investing activities:      
Purchases of property and equipment and capitalized software (2,369) (3,269) (2,353)
Repayment (issuance) of notes receivable 1,047 10,000 (7,486)
Net Cash (used in) provided by Investing Activities (1,322) 6,731 (9,839)
Cash flows from Financing activities:      
Payments of debt issuance costs (1,104) (91)  
Proceeds from issuance of long-term debt 25,000    
Repayment of long-term debt (1,200)    
Proceeds from the issuance of common stock     80,972
Payments of common stock offering issuance cost     (401)
Proceeds from exercises of stock options 1 298 2,435
Net Cash provided by Financing activities 22,697 207 83,006
Net (decrease) increase in Cash and Cash equivalents (10,663) (23,801) 45,184
Cash and Cash equivalents, Beginning of Period 70,340 94,141 48,957
Cash and Cash equivalents, End of Period 59,677 70,340 94,141
Supplemental disclosure of cash flow information:      
Cash paid for interest 4,790 3,543 3,304
Transfer of inventory to property and equipment 210 250 601
Supplemental disclosure of non-cash investing and financing activities:      
Purchases of property and equipment and capitalized software in accounts payable and accrued expenses 239 103 273
Reduction of accounts receivable in current and long-term notes receivable $ 6,468 $ 432 $ 2,514