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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |
Net income (loss) | $ (25,834) | $ 1,277
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 3,525 | 1,850
Stock-based compensation | 6,308 | 252
Trade-in guarantee | (268) | (537)
Inventory write-downs | 3,109 |
Warrant revaluation | 0 | 970
Noncash interest expense | 367 | 1,031
Deferred income taxes | 109 | 140
Provision for doubtful accounts | 45 | 5
Changes in operating assets and liabilities: |  |
Accounts receivable | 8,749 | (8,065)
Inventory | (809) | (12,847)
Prepaid expenses and other current assets | 3,681 | (4,127)
Other assets | (3,803) | (42)
Accounts payable | (20,075) | 16,049
Accrued expenses | (6,117) | 7,408
Deferred revenue | (3,664) | 82
Income tax payable | 1,154 | 415
Net cash provided by (used in) operating activities | (33,523) | 3,861
Cash flows from investing activities: |  |
Purchase of property and equipment | (992) | (787)
Development of tooling and purchased software licenses | (364) | (1,758)
Net cash used in investing activities | (1,356) | (2,545)
Cash flows from financing activities: |  |
Proceeds on line of credit | 5,614 | 72,135
Repayment on line of credit | (5,614) | (75,050)
Proceeds from issuance of common stock, net of costs | 1,604 | 8,295
Cost associated with amendments to credit agreements |  | (69)
Proceeds from issuance of common stock upon IPO, net of costs | 36,864 |
Taxes paid on net issuance of restricted stock award | (1,897) |
Proceeds from exercise of warrants | 23 | 47
Proceeds from exercise of stock options | 81 | 17
Proceeds from ESPP | 146 |
Proceeds from borrowings on long-term debt |  | 4,992
Repayment of long-term debt | (3,693) | (215)
Net cash provided by financing activities | 33,128 | 10,152
Net increase (decrease) in cash and cash equivalents | (1,751) | 11,468
Cash and cash equivalents at beginning of the year | 13,049 | 1,581
Cash and cash equivalents at end of the year | 11,298 | 13,049
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 1,043 | 546
Cash paid for income taxes | 273 | 259
Non-cash investing and financing activities: |  |
Other assets included in accounts payable |  | 40
IPO issuance costs included in accounts payable | $ 14 |
Payment of dividends in shares of convertible preferred stock |  | 10,152
Conversion of preferred stock to common stock |  | 93,547
Reclassification of warrant (liability to preferred stock) upon exercise of preferred stock |  | 2,951
Reclassification of warrant (liability to additional paid-in capital) upon conversion and elimination of preferred stock |  | $ 1,804

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