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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 103,885 | $ 48,070 | $ 14,678
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of deferred revenue | (11,122) | (7,406) | (8,994)
Depreciation | 4,919 | 4,270 | 3,086
Amortization of intangibles | 21,983 | 16,492 | 10,999
Inventory write-down |  |  | 33,000
Amortization of premium and discount on investments, net | (2,871) | (1,830) | (697)
Stock-based compensation to employees | 12,284 | 11,374 | 9,173
Stock-based compensation to Board of Directors and Scientific Advisory Board | 2,609 | 1,715 | 1,291
Change in earnout liability recorded for Adesis acquistion | 519 |  |
Deferred income tax expense | 24,396 | 3,094 | 7,137
Excess tax benefits from share-based payment arrangements |  | (4,232) |
Retirement plan benefit expense | 4,351 | 3,965 | 3,354
Decrease (increase) in assets, net of effect of acquisition: |  |  |
Accounts receivable | (27,361) | 1,205 | (2,654)
Inventory | (18,951) | (4,460) | (8,639)
Other current assets | (3,884) | (3,870) | 1,969
Other assets | (297) | (133) | 251
Increase (decrease) in liabilities: |  |  |
Accounts payable and accrued expenses | 16,420 | 4,362 | 790
Other current liabilities | (1,917) | 4,362 | 56
Deferred revenue | 8,402 | 3,360 | 48,812
Net cash provided by operating activities | 133,365 | 80,338 | 113,612
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (29,803) | (7,300) | (5,103)
Purchase of intangibles |  | (95,989) |
Purchase of business, net of cash acquired |  | (33,380) |
Purchases of investments | (594,283) | (450,277) | (691,876)
Proceeds from sale of investments | 498,508 | 548,474 | 638,411
Net cash used in investing activities | (125,578) | (38,472) | (58,568)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 734 | 439 | 354
Proceeds from the exercise of common stock options | 38 | 185 | 2,034
Payment of withholding taxes on stock-based compensation to employees | (9,432) | (4,870) | (5,337)
Excess tax benefits from share-based payment arrangements |  | 4,232 |
Cash dividends paid | (5,652) |  |
Net cash used in financing activities | (14,312) | (14) | (2,949)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (6,525) | 41,852 | 52,095
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 139,365 | 97,513 | 45,418
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 132,840 | $ 139,365 | $ 97,513

X
- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Also includes the cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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