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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (29,075) $ (32,055)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 11,593 10,500
Loss on disposal of fixed assets 0 1
Impairment of capitalized software development costs 1,717 0
Change in allowance for credit losses 40 (1)
Inventory write-downs 284 380
Depreciation and amortization expense 823 846
Amortization of debt discount and debt issuance costs 30 22
Net accretion of discounts on marketable securities (871) (437)
Non-cash lease expense 1,211 1,324
Net changes in operating assets and liabilities:    
Accounts receivable 792 (184)
Inventory (672) (267)
Prepaid expenses and other current assets 622 25
Other assets 66 17
Accounts payable 1,630 350
Accrued liabilities (4,246) 501
Income taxes payable (22) 19
Lease liabilities (1,492) (1,550)
Deferred revenue 5 (26)
Net cash used in operating activities (17,565) (20,535)
Cash flows from investing activities    
Purchases of investments (20,837) (25,624)
Maturities of investments 18,415 25,500
Purchases of property and equipment and internal software development costs (920) (115)
Net cash used in investing activities (3,342) (239)
Cash flows from financing activities    
Proceeds from borrowing under term loan 0 20,000
Repayment of credit agreement (46) (47)
Proceeds from exercise of common stock options 80 183
Proceeds from issuance of common stock under the employee stock purchase plan 808 676
Net cash provided by financing activities 842 20,812
Effect of exchange rate changes on cash and cash equivalents 2 42
Net (decrease) increase in cash, cash equivalents, and restricted cash (20,063) 80
Cash, cash equivalents, and restricted cash at beginning of the period 83,784 101,967
Cash, cash equivalents, and restricted cash at end of the period 63,721 102,047
Reconciliation of cash, cash equivalents, and restricted cash to consolidated balance sheets:    
Cash and cash equivalents 63,464 101,581
Restricted cash 257 466
Cash, cash equivalents, and restricted cash in consolidated balance sheets 63,721 102,047
Supplemental non-cash items:    
Lapse in repurchase rights of common stock 0 103
Purchases of property and equipment in accounts payable and accrued liabilities 169 450
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 276 206
Cash paid for interest $ 1,778 $ 1,235