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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (16,269) $ (17,067)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 192 146
Accretion of debt discount and amortization of debt issuance costs 94 144
Stock-based compensation expense 4,506 3,523
Provision for credit losses 36 (250)
Provision for excess and obsolete inventories (25) 12
Noncash operating lease expense 160 242
Loss on disposal of property and equipment 0 66
Noncash loss on extinguishment of debt 1,033 0
Changes in operating assets and liabilities:    
Accounts receivable (1,390) (959)
Inventory 1,003 (1,036)
Prepaid expenses and other current assets 317 593
Other noncurrent assets 12 (13)
Accounts payable 371 878
Accrued compensation (501) (2,394)
Accrued and other current liabilities 2,116 (1,345)
Other noncurrent liabilities (1,441) 77
Net cash used in operating activities (9,786) (17,383)
Cash flows from investing activities    
Purchases of property and equipment (117) (126)
Net cash used in investing activities (117) (126)
Cash flows from financing activities    
Net proceeds from Hercules Loan Agreement 34,526 0
Repayment of MidCap Term Loan (35,375) 0
Debt issuance costs (238) 0
Taxes paid on the net share settlement of restricted stock units 0 (205)
Proceeds from exercise of common stock options 145 49
Net cash used in financing activities (942) (156)
Net change in cash and cash equivalents (10,845) (17,665)
Cash and cash equivalents at beginning of period 138,129 185,000
Cash and cash equivalents at end of period 127,284 167,335
Supplemental disclosure of cash flow information    
Cash paid for interest 1,054 1,002
Supplemental noncash disclosure of investing and financing activities    
Acquisition of property and equipment included in accounts payable and accrued liabilities 0 10
Common stock warrants issued upon execution of term loan agreement $ 609 $ 0