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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net income (loss) | $ 29,446 | $ 6,220 | $ (4,112)
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Depreciation | 1,799 | 1,197 | 637
Loss on fixed asset disposal | 0 | 0 | 37
Amortization of intangible assets | 933 | 928 | 1,054
Impairment of intangible assets | 0 | 0 | 368
Amortization of debt discount and deferred financing costs | 42 | 0 | 1,328
Share-based compensation | 16,896 | 11,453 | 6,010
Change in deferred income taxes | (7,081) | 0 | 0
Increase (decrease) in cash resulting from changes in: |  |  |
Accounts receivable | (27,083) | (10,579) | (8,439)
Inventory | (2,327) | (1,252) | (858)
Prepaid expenses and other assets | (2,094) | (203) | (637)
Accounts payable | 3,136 | 1,287 | 1,209
Accrued compensation | 3,511 | 5,935 | 2,836
Accrued expenses | 2,140 | 1,098 | 353
Accrued interest | 0 | 0 | (42)
Other liabilities | (511) | 718 | (28)
Net cash flows from operating activities | 18,807 | 16,802 | (284)
Cash flows from investing activities: |  |  |
Purchases of equipment | (5,827) | (2,558) | (2,337)
Maturity (purchases) of fixed maturity securities | 6,000 | (9,000) | 0
Patent application costs | (851) | (594) | (689)
Net cash flows from investing activities | (678) | (12,152) | (3,026)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 4,629 | 2,470 | 1,981
Proceeds from exercise of warrants | 46 | 1,113 | 2,108
Proceeds from public offering, net of expenses | 0 | 0 | 36,602
Deferred financing costs | (504) | 0 | 0
Stock repurchase | (40,279) | (5,612) | 0
Principal payments of equipment leases | (117) | (117) | (57)
Net cash flows from financing activities | (36,225) | (2,146) | 40,634
Net change in cash | (18,096) | 2,504 | 37,324
Cash and cash equivalents, beginning of period | 46,582 | 44,078 | 6,754
Cash and cash equivalents, end of period | $ 28,486 | $ 46,582 | $ 44,078

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition 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 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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