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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net loss $ (29,855) $ (17,491)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 289 288
Accretion of debt discount and amortization of debt issuance costs 346 280
Stock-based compensation expense 1,208 126
Provision for doubtful accounts receivable 104 229
Provision for excess and obsolete inventories 276 841
Noncash operating lease expense 310 270
Change in fair value of redeemable convertible preferred stock warrant 4,872 (19)
Loss on disposal of property and equipment 74 74
Proceeds from Paycheck Protection Program loan   (2,246)
Changes in operating assets and liabilities:    
Accounts receivable (1,628) 880
Inventory (255) (1,138)
Prepaid expenses and other current assets (1,197) (288)
Other noncurrent assets (3,081)  
Accounts payable 1,438 752
Accrued compensation 13 (311)
Accrued and other current liabilities 1,594 2,288
Other noncurrent liabilities 186 456
Net cash used in operating activities (25,306) (15,009)
Cash flows from investing activities    
Purchases of property and equipment (369) (532)
Net cash used in investing activities (369) (532)
Cash flows from financing activities    
Payments of costs related to initial public offering (471)  
Proceeds from the issuance of Series E redeemable convertible preferred stock   30,150
Series E issuance costs   (106)
Proceeds from exercise of common stock warrants 207 8
Net cash (used in) provided by financing activities (264) 30,052
Net change in cash and cash equivalents (25,939) 14,511
Cash and cash equivalents at beginning of period 61,511 21,237
Cash and cash equivalents at end of period 35,572 35,748
Supplemental disclosure of cash flow information    
Cash paid for interest 1,548 623
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities 181 66
Unpaid initial public offering costs in accounts payable and accrued liabilities $ 2,764 $ 0