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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 39,591,000 | $ 71,072,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred revenue and recognition of unbilled receivables | (52,325,000) | (7,206,000)
Depreciation | 6,094,000 | 3,638,000
Amortization of intangibles | 16,479,000 | 16,485,000
Inventory write-down | 1,045,000 | 0
Amortization of premium and discount on investments, net | (4,191,000) | (2,055,000)
Stock-based compensation to employees | 9,697,000 | 8,467,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 3,234,000 | 1,890,000
Earnout liability recorded for Adesis acquisition |  | 509,000
Deferred income tax expense | 15,820,000 | 6,804,000
Retirement plan expense | 3,378,000 | 3,214,000
Decrease (increase) in assets: |  |
Accounts receivable | 9,148,000 | (18,262,000)
Inventory | (33,811,000) | (15,419,000)
Other current assets | (116,000) | (2,835,000)
Other assets | (37,769,000) | (40,000)
Increase (decrease) in liabilities: |  |
Accounts payable and accrued expenses | 439,000 | 3,904,000
Other current liabilities | (34,000) | (768,000)
Deferred revenue | 99,940,000 | 1,863,000
Other liabilities | 18,337,000 |
Net cash provided by operating activities | 94,956,000 | 71,261,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (20,925,000) | (23,221,000)
Purchases of investments | (500,985,000) | (456,264,000)
Proceeds from sale of investments | 415,697,000 | 351,024,000
Net cash used in investing activities | (106,213,000) | (128,461,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of common stock | 616,000 | 529,000
Repurchase of common stock | (477,000) |
Proceeds from the exercise of common stock options |  | 29,000
Payment of withholding taxes related to stock-based compensation to employees | (11,598,000) | (9,330,000)
Cash dividends paid | (8,486,000) | (4,240,000)
Net cash used in financing activities | (19,945,000) | (13,012,000)
DECREASE IN CASH AND CASH EQUIVALENTS | (31,202,000) | (70,212,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 132,840,000 | 139,365,000
CASH AND CASH EQUIVALENTS, END OF PERIOD | $ 101,638,000 | $ 69,153,000

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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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