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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities |  |
Net income (loss) | $ (708) | $ 22,325
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation and amortization | 13,654 | 9,216
Loss on rental units and other fixed assets | 502 | 473
Gain on sale of former rental assets | (84) | (64)
Provision for sales revenue returns and doubtful accounts | 8,341 | 13,204
Provision for rental revenue adjustments | 2,115 | 1,701
Provision for inventory losses | 720 | 593
Stock-based compensation expense | 6,111 | 6,930
Deferred income taxes | 369 | 5,908
Change in fair value of earnout liability | (166) |
Changes in operating assets and liabilities: |  |
Accounts receivable | (7,716) | (19,109)
Inventories | 2,597 | (7,936)
Income tax receivable | (129) | (212)
Prepaid expenses and other current assets | (8,695) | (3,607)
Operating lease right-of-use asset | (3,463) | (6,356)
Other noncurrent assets | 2,105 | (2,088)
Accounts payable and accrued expenses | (1,495) | 3,462
Accrued payroll | 1,017 | (4,702)
Warranty reserve | 1,356 | 1,946
Deferred revenue | 375 | 2,825
Income tax payable | 265 | 210
Operating lease liability | 3,744 | 7,317
Other noncurrent liabilities |  | (832)
Net cash provided by operating activities | 20,815 | 31,204
Cash flows from investing activities |  |
Purchases of marketable securities | (6,531) | (58,681)
Maturities of marketable securities | 11,057 | 57,900
Investment in intangible assets | (215) | (31)
Investment in property and equipment | (3,352) | (2,275)
Production and purchase of rental equipment | (8,217) | (2,187)
Proceeds from sale of former assets | 140 | 166
Payment for acquisition, net of cash acquired |  | (70,401)
Net cash used in investing activities | (7,118) | (75,509)
Net cash used in investing activities | (7,118) | (75,509)
Cash flows from financing activities |  |
Proceeds from stock options exercised | 186 | 2,036
Proceeds from employee stock purchases | 2,084 | 2,748
Payment of employment taxes related to release of restricted stock | (288) | (837)
Net cash provided by financing activities | 1,982 | 3,947
Effect of exchange rates on cash | 268 | (145)
Net increase (decrease) in cash and cash equivalents | 15,947 | (40,503)
Cash and cash equivalents, beginning of period | 198,037 | 196,634
Cash and cash equivalents, end of period | 213,984 | 156,131
Supplemental disclosures of cash flow information |  |
Cash paid during the period for income taxes, net of refunds received | 158 | 221
Supplemental disclosure of non-cash transactions |  |
Accrued value of earnout related to acquisition |  | 25,749
Property and equipment in accounts payable and accrued liabilities | $ 32 | $ 18

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