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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (26,905) | $ (23,524)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 1,631 | 2,321
Stock-based compensation | 760 | 770
Inventory write-downs |  | 407
Non-cash interest expense |  | 335
Accretion of debt discount |  | 159
Loss on disposal of asset | 59 |
Deferred income taxes | (9) | (1)
Bad debt expense | 685 | 289
Changes in operating assets and liabilities: |  |
Accounts receivable | 669 | 4,897
Non-trade receivable | (2,392) | (619)
Inventory | 1,438 | 6,296
Prepaid expenses and other current assets | 589 | 44
Other assets | (1,134) | 134
Accounts payable | 3,648 | 3,210
Accrued expenses | 248 | 4,399
Warranty liability | (234) | (235)
Deferred revenue | (5) | (1)
Income tax payable | 40 | 174
Net cash used in operating activities: | (20,912) | (710)
Cash flows from investing activities: |  |
Purchase of property and equipment | (20) | (203)
Net cash used in investing activities | (20) | (203)
Cash flows from financing activities: |  |
Repayment on long-term debt | (111) | (4,109)
Proceeds from PPP Loan |  | 2,289
Repayment of PPP Loan |  | (2,289)
Proceeds from issuance of common stock, net of costs | 9,046 | 25,056
Taxes paid on net issuance of restricted stock units |  | (6)
Proceeds from ESPP purchase of stock | 38 | 42
Proceeds from exercise of stock options | 5 | 304
Net cash provided by financing activities | 8,978 | 21,287
Net increase (decrease) in cash and cash equivalents | (11,954) | 20,374
Cash and cash equivalents at beginning of period | 22,141 | 11,298
Cash and cash equivalents at end of period | 10,187 | 31,672
Supplemental disclosure of cash flow information: |  |
Cash paid for interest |  | 260
Cash paid for income taxes | 45 | 76
Non-cash investing and financing activities: |  |
Issuance of common stock included in other assets | $ 1,291 |
Other assets included in accounts payable |  | 108
Settlement of long-term debt with issuance of common stock |  | $ 6,170

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