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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (17,060) | $ (10,723)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 1,647 | 1,798
Stock-based compensation | 458 | 5,604
Inventory write-downs | 407 |
Trade-in guarantee |  | (268)
Non-cash interest expense | 166 | 50
Accretion of debt discount | 159 | 60
Deferred income taxes | 30 | (11)
Bad debt expense | 289 |
Changes in operating assets and liabilities: |  |
Accounts receivable | 4,814 | (12,420)
Inventory | 3,899 | (4,664)
Prepaid expenses and other current assets | (150) | 627
Other assets | 138 | (2,360)
Accounts payable | 4,000 | (9,928)
Accrued expenses | 6,631 | 937
Deferred revenue | 55 | (3,649)
Income tax payable | 179 | 163
Net cash provided by (used in) operating activities | 5,662 | (34,784)
Cash flows from investing activities: |  |
Purchase of property and equipment | (193) | (247)
Development of tooling and purchased software licenses |  | (244)
Net cash used in investing activities | (193) | (491)
Cash flows from financing activities: |  |
Repayment on long-term debt | (4,037) |
Proceeds on line of credit |  | 5,614
Repayment on line of credit |  | (5,878)
Proceeds from PPP Loan | 2,289 |
Repayment of PPP Loan | (2,289) |
Proceeds from issuance of common stock, net of costs | 24,992 | 1,604
Proceeds from issuance of common stock upon IPO, net of costs |  | 38,399
Taxes paid on net issuance of restricted stock award and restricted stock units | (6) | (1,897)
Proceeds from exercise of warrants |  | 23
Proceeds from ESPP purchase of stock | 43 |
Proceeds from exercise of stock options | 303 | 55
Net cash provided by financing activities | 21,295 | 37,920
Net increase in cash and cash equivalents | 26,764 | 2,645
Cash and cash equivalents at beginning of period | 11,298 | 13,049
Cash and cash equivalents at end of period | 38,062 | 15,694
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 260 | 1,055
Cash paid for income taxes | 77 | 352
Non-cash investing and financing activities: |  |
Other assets included in accounts payable | 110 | 1
IPO issuance costs included in accounts payable |  | $ 1,550
Settlement of long-term debt with issuance of common stock | $ 6,001 |

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