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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 14,678,000 | $ 41,854,000 | $ 74,052,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of deferred revenue | (8,994,000) | (4,274,000) | (5,880,000)
Depreciation | 3,086,000 | 2,077,000 | 2,044,000
Amortization of intangibles | 10,999,000 | 10,996,869 | 10,973,141
Inventory Write-down | 33,000,000 | 3,900,000 | 0
Amortization of premium and discount on investments, net | (697,000) | (531,000) | (458,000)
Stock-based compensation to employees | 9,173,000 | 7,278,000 | 6,077,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 1,291,000 | 995,000 | 809,000
Deferred income tax expense (benefit) | 7,137,000 | 9,108,000 | (41,418,000)
Retirement plan benefit expense | 3,354,000 | 1,679,000 | 1,665,000
(Increase) decrease in assets: |  |  |
Accounts receivable | (2,654,000) | (6,418,000) | (7,000,000)
Inventories | (8,639,000) | (30,414,000) | 424,000
Other current assets | 1,969,000 | 2,267,000 | (2,706,000)
Other assets | 251,000 | (183,000) | 35,000
Increase (decrease) in liabilities: |  |  |
Accounts payable and accrued expenses | 790,000 | 3,055,000 | 3,614,000
Other current liabilities | 56,000 | 87,000 | (11,000)
Deferred revenue | 48,812,000 | 5,793,000 | 2,767,000
Net cash provided by operating activities | 113,612,000 | 47,270,000 | 44,987,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (5,103,000) | (6,153,000) | (4,710,000)
Additions to intangibles | 0 | 0 | (359,000)
Purchases of investments | (691,876,000) | (408,974,000) | (362,838,000)
Proceeds from sale of investments | 638,411,000 | 372,818,000 | 313,132,000
Net cash used in investing activities | (58,568,000) | (42,309,000) | (54,775,000)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 354,000 | 328,000 | 343,000
Repurchase of common stock | 0 | (29,500,000) | (5,456,000)
Proceeds from the exercise of common stock options | 2,034,000 | 1,887,000 | 2,832,000
Payment of withholding taxes related to stock-based compensation to employees | (5,337,000) | (2,844,000) | (3,268,000)
Net cash used in financing activities | (2,949,000) | (30,129,000) | (5,549,000)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 52,095,000 | (25,168,000) | (15,337,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 45,418,000 | 70,586,000 | 85,923,000
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 97,513,000 | $ 45,418,000 | $ 70,586,000

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- 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 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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=56944662&loc=d3e3213-108585 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: 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=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: 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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=56944662&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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=56944662&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.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: 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=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A -Subsection 1 + 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=56944662&loc=d3e3602-108585 + Details
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