v3.22.4
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities:      
Net loss $ (33,592) $ (21,279) $ (24,010)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation 5,402 3,113 1,950
Amortization expense - right-of-use assets - operating and finance leases 4,849 2,834 2,604
Stock-based compensation 14,531 11,593 7,728
Provision for credit losses 4 342 40
Equity securities earned from research and development activities from a related party (1,245) (1,955) (900)
Unrealized gain on non-marketable securities (($208) and ($983) from a related party) (208) (1,272) 0
Other non-cash items (29) (19) 15
Changes in operating assets and liabilities:      
Financial assets ($0, $0 and ($450) from a related party) (3,225) (9,156) (8,723)
Inventories (869) (196) (593)
Prepaid expenses and other assets 181 (2,268) (1,012)
Accounts payable 207 268 101
Accrued compensation and other accrued liabilities 5,983 6,575 6,175
Other long-term liabilities (5,223) (4,147) (2,586)
Deferred revenue ($0, $245, $0 to a related party) 24,518 1,300 2,747
Net cash provided by (used in) operating activities 11,284 (14,267) (16,464)
Investing activities:      
Purchase of property and equipment (8,307) (13,828) (3,748)
Proceeds from sale of property and equipment 29 36 0
Investment in non-marketable securities ($0, ($7,630) and ($1,000) in a related party) (5,300) (7,630) (2,000)
Net cash used in investing activities (13,578) (21,422) (5,748)
Financing activities:      
Proceeds from exercises of stock options 955 5,180 1,323
Proceeds from issuance of common stock in connection with public offering 0 0 86,250
Costs incurred in connection with equity financing (42) (207) (5,448)
Payments of lease obligations - Finance leases 0 0 (60)
Taxes paid related to net share settlement of equity awards (1,488) (1,206) (1,257)
Net cash provided by (used in) financing activities (575) 3,767 80,808
Net increase (decrease) in cash, cash equivalents and restricted cash (2,869) (31,922) 58,596
Cash, cash equivalents and restricted cash at the beginning of the year 118,895 150,817 92,221
Cash, cash equivalents and restricted cash at the end of the year 116,026 118,895 150,817
Supplemental disclosure of cash flow information:      
Interest paid 34 14 52
Income taxes 100 102 312
Supplemental non-cash investing and financing activities:      
Capital expenditures incurred but not yet paid 897 2,533 1,750
Cash and cash equivalents 113,984 116,797 149,117
Restricted cash, current and non-current 2,042 2,098 1,700
Total cash, cash equivalents and restricted cash at the end of the period $ 116,026 $ 118,895 $ 150,817

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