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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |  |
Net income | $ 20,950 | $ 51,845 | $ 21,002
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 13,834 | 11,295 | 12,302
Loss on rental assets and other fixed assets | 568 | 1,160 | 1,136
Gain on sale of former rental assets | (68) | (416) | (64)
Provision for sales revenue returns and doubtful accounts | 17,177 | 17,518 | 13,773
Provision for rental revenue adjustments | 2,233 | 2,678 | 5,057
Provision for inventory losses | 972 | 351 | 340
Stock-based compensation expense | 9,129 | 12,790 | 9,640
Deferred income taxes | 2,873 | (11,595) | 7,947
Change in fair value of earnout liability | 810 |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (16,707) | (25,963) | (18,263)
Inventories | (10,336) | (9,972) | (5,894)
Income tax receivable | (321) | (1,348) | (875)
Prepaid expenses and other current assets | (2,693) | (4,524) | (782)
Operating lease right-of-use asset | (5,856) |  |
Other noncurrent assets | (2,064) | (1,626) |
Accounts payable and accrued expenses | 3,202 | 6,360 | 7,438
Accrued payroll | (5,188) | 4,538 | 722
Warranty reserve | 3,041 | 3,359 | 2,689
Deferred revenue | 2,724 | 3,360 | 3,654
Income tax payable | 429 | 64 | 225
Operating lease liability | 6,716 |  |
Other noncurrent liabilities | (832) | 103 | 447
Net cash provided by operating activities | 40,593 | 59,977 | 60,494
Cash flows from investing activities |  |  |
Purchases of marketable securities | (58,686) | (76,162) | (46,933)
Maturities of marketable securities | 91,350 | 63,455 | 37,041
Investment in intangible assets | (254) | (350) | (3,316)
Investment in property and equipment | (3,143) | (8,043) | (2,914)
Production and purchase of rental equipment | (3,117) | (4,580) | (3,997)
Proceeds from sale of former assets | 194 | 715 | 183
Payment for acquisition, net of cash acquired | (70,401) |  | (4,494)
Net cash used in investing activities | (44,057) | (24,965) | (24,430)
Cash flows from financing activities |  |  |
Proceeds from stock options exercised | 3,109 | 17,156 | 12,625
Proceeds from employee stock purchases | 2,748 | 2,348 | 1,379
Payment of employment taxes related to release of restricted stock | (928) | (1,208) |
Net cash provided by financing activities | 4,929 | 18,296 | 14,004
Effect of exchange rates on cash | (62) | 373 | 34
Net increase in cash and cash equivalents | 1,403 | 53,681 | 50,102
Cash and cash equivalents, beginning of period | 196,634 | 142,953 | 92,851
Cash and cash equivalents, end of period | 198,037 | 196,634 | 142,953
Supplemental disclosures of cash flow information |  |  |
Cash paid during the period for income taxes, net of refunds received | 239 | 1,653 | 1,267
Supplemental disclosure of non-cash transactions |  |  |
Accrued value of earnout related to acquisition | 25,749 |  |
Property and equipment in account payable and accrued liabilities | $ 66 | $ 125 | $ 70

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