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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 | $ 17,034 | $ 45,885 | $ 126,959
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Depreciation and amortization | 7,880 | 5,772 | 5,002
Deferred income taxes | 3,304 | 11,209 | (82,085)
Stock-based compensation expense | 8,173 | 7,784 | 5,672
Provision for doubtful accounts | 818 |  |
Provision for excess and obsolete inventory | 2,794 | 2,205 | 8,135
Changes in operating assets & liabilities: |  |  |
Accounts receivable | (6,002) | (3,877) | (23,573)
Inventories | (17,953) | (10,512) | (10,567)
Prepaid expenses and other current assets | (104) | (1,436) | (3,866)
Accounts payable and other current liabilities | (19,150) | (703) | 25,000
Deferred revenue | 6,672 | 6,055 | 7,079
Income taxes | (162) | 196 | 14
Other assets and liabilities | (16,898) | (15,613) | (1,486)
Net cash (used in) provided by operating activities | (13,594) | 46,965 | 56,284
Cash flows from investing activities |  |  |
Expenditures for property, plant and equipment and capitalized software | (11,969) | (4,715) | (7,285)
Net cash used in investing activities | (11,969) | (4,715) | (7,285)
Cash flows from financing activities |  |  |
Net settlement on restricted stock grants | (1,632) | (1,419) | (1,184)
Repurchase of common stock | (17,744) |  |
Proceeds from Employee Stock Purchase Plan | 863 | 871 | 739
Proceeds from exercise of stock options | 5,105 | 1,734 | 15,515
Net cash (used in) provided by financing activities | (13,408) | 1,186 | 15,070
Effect of exchange rate changes on cash and cash equivalents | 603 | 586 | (844)
Net (decrease) increase in cash, cash equivalents and restricted cash | (38,368) | 44,022 | 63,225
Cash, cash equivalents and restricted cash at beginning of period | 184,902 | 140,880 | 77,655
Cash, cash equivalents and restricted cash at end of period | 146,534 | 184,902 | 140,880
Supplemental disclosure of cash flow information |  |  |
Income taxes | 1,028 | 858 | 583
Interest | $ 5,207 | $ 5,470 | $ 5,315

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