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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities    
Net loss $ (58,923) $ (48,661)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 16,445 10,530
Write-off of fixed assets 7 7
Allowance for doubtful accounts 54 4
Inventory write-downs 485 1,186
Depreciation and amortization expense 1,513 867
Amortization of debt discount and debt issuance costs 56 106
Amortization of premiums and discounts on marketable securities (204) 59
Non-cash lease expense 2,498 2,360
Net changes in operating assets and liabilities:    
Accounts receivable (2,190) (2,432)
Inventory (3,638) (6,458)
Prepaid expenses and other current assets 780 (1,214)
Other assets (49) (221)
Accounts payable 247 87
Accrued liabilities 149 4,800
Income taxes payable (124) 21
Lease liabilities (2,197) (2,517)
Deferred tax liability 49 (6)
Deferred revenue (41) 94
Net cash used in operating activities (45,083) (41,388)
Cash flows from investing activities    
Purchases of investments (47,187) (52,584)
Maturities of investments 44,280 10,000
Purchases of property and equipment (1,318) (3,671)
Net cash used in investing activities (4,225) (46,255)
Cash flows from financing activities    
Repayment of Credit Agreement (87) 0
Debt issuance cost (53) (41)
Proceeds from exercise of common stock options 644 1,871
Proceeds from issuance of common stock under the employee stock purchase plan 1,942 2,652
Payments for the repurchase of early exercised common stock options (27) (26)
Net cash provided by financing activities 2,419 4,456
Effect of exchange rate changes on cash and cash equivalents 145 106
Net decrease in cash and cash equivalents (46,744) (83,081)
Cash and cash equivalents at beginning of year 148,711 231,792
Cash, cash equivalents and restricted cash at end of year 101,967 148,711
Reconciliation of cash, cash equivalents and restricted cash to consolidated balance sheets:    
Cash and cash equivalents 101,736 148,480
Restricted cash 231 231
Cash, cash equivalents and restricted cash in consolidated balance sheets 101,967 148,711
Supplemental non-cash items:    
Lapse in repurchase rights of common stock 227 204
Purchases of property and equipment in accounts payable and accrued liabilities 425 584
Operating lease right of use assets obtained in exchange for new lease liabilities 229 1,460
Amount receivable from exercise of Options 0 10
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 398 322
Cash paid for interest $ 847 $ 722