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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income (loss) | $ 15,424 | $ (12,951) | $ (92)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities: |  |  |
Depreciation and amortization | 6,306 | 6,264 | 5,482
Amortization of lease right-of-use assets | 3,557 |  |
Deferred income tax benefit | (66,306) |  |
Loss on disposal of fixed assets | 430 | 156 | 6
Stock-based compensation | 36,393 | 25,704 | 17,592
Fair value of cash-settled stock options | 3,088 |  |
Unrealized foreign currency losses (gains) | 194 | 1,647 | (951)
Amortization of (discount) premium on short-term investments | (338) | (295) | 20
Deferred rent and other liabilities | 5,352 | 1,919 | 722
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (6,632) | (2,252) | (2,181)
Inventory, net | 4,078 | (2,303) | (4,162)
Prepaid expenses and other current assets | (917) | (1,756) | 494
Accounts payable and accrued liabilities | 779 | 2,527 | 9,741
Deferred tax asset and receivable, net |  |  | (235)
Other assets | (1,777) | 204 | (345)
Net cash (used in) provided by operating activities | (369) | 18,864 | 26,091
Investing activities |  |  |
Cash acquired due to acquisition | 49,652 |  |
Purchases of property and equipment | (4,724) | (10,315) | (6,311)
Purchases of short-term investments | (80,388) | (93,696) | (94,307)
Proceeds from sales and maturities of short-term investments | 80,494 | 78,851 | 88,891
Investment in company-owned life insurance | (1,608) | (1,240) | (663)
Net cash provided by (used) in investing activities | 43,426 | (26,400) | (12,390)
Financing activities |  |  |
Proceeds from exercise of stock options | 15,064 | 18,654 | 3,699
Share purchases under Employee Stock Purchase Plan | 3,388 | 3,509 | 968
Payments of employee taxes related to vested restricted stock units | (5,601) | (587) |
Payment of debt assumed on the Avedro Merger | (22,496) |  |
Net cash (used in) provided by financing activities | (9,645) | 21,576 | 4,667
Effect of exchange rate changes on cash and cash equivalents | (252) | 48 | (434)
Net increase in cash, cash equivalents and restricted cash | 33,160 | 14,088 | 17,934
Cash, cash equivalents and restricted cash at beginning of period | 38,596 | 24,508 | 6,574
Cash, cash equivalents and restricted cash at end of period | 71,756 | 38,596 | 24,508
Supplemental schedule of noncash investing and financing activities |  |  |
Shares issued and Replacement Awards assumed in connection with Avedro Merger | 437,751 |  |
Debt assumed in the Avedro Merger | 22,496 |  |
Purchase of property and equipment included in accounts payable and accrued liabilities | 995 | 152 | 749
Reduction of liability upon vesting of stock options previously exercised for unvested stock |  |  | 4
Supplemental disclosures of cash flow information |  |  |
Taxes paid, net of refunds | 171 | $ 401 | $ 12
Interest paid | $ 2 |  |

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