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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net loss | $ (10,445,462) | $ (14,411,144) | $ (13,356,425)
Adjustments to reconcile net loss to net cash used for operating activities: |  |  |
Depreciation | 487,611 | 361,617 | 203,140
Amortization of intangible assets | 78,993 | 74,871 | 45,828
Amortization of deferred financing costs | 246,557 | 124,915 | 127,913
Write off of deferred financing costs |  | 750,474 |
Provision for bad debt | 223,323 | 79,593 | 125,371
Stock-based compensation | 3,608,918 | 1,390,277 | 1,316,509
Interest added to note payable |  | 1,924,279 | 461,643
Change in assets and liabilities: |  |  |
Accounts receivable | (3,235,840) | (3,348,807) | (2,036,052)
Inventory | (1,857,102) | (1,524,880) | (720,340)
Prepaid expenses and other | (341,577) | (86,879) | (315,556)
Accounts payable and accrued expenses | 1,926,664 | 3,411,507 | 1,117,733
Deferred liabilities | 70,316 | 17,582 | (21,583)
Net cash used for operating activities | (9,237,599) | (11,236,595) | (13,051,819)
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (1,105,212) | (931,634) | (408,782)
Acquisition of intangible assets | (187,006) | (225,768) | (146,736)
Net cash used for investing activities | (1,292,218) | (1,157,402) | (555,518)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock | 15,662,905 | 18,668,092 | 30,968,386
Borrowing on revolving loan | 57,599,165 | 6,684,894 |
Payments on revolving loan | (57,624,188) | (6,684,894) |
Repayments of long-term debt | (20,899) | (2,446,676) |
Debt issuance costs | (29,472) | (800,847) | (180,139)
Proceeds from exercise of stock options | 1,434,525 | 1,078,333 | 512,799
Net cash provided by financing activities | 17,022,036 | 16,498,902 | 31,301,046
Net increase in cash and cash equivalents | 6,492,219 | 4,104,905 | 17,693,709
Cash and cash equivalents, beginning of year | 30,014,405 | 25,909,500 | 8,215,791
Cash and cash equivalents, end of period | 36,506,624 | 30,014,405 | 25,909,500
Supplemental disclosures of cash flow activity: |  |  |
Cash paid for interest | 2,198,286 | 5,769,372 | 3,525,978
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Payments of fixed assets in accounts payable | 55,385 | 32,153 | $ 168,775
Payments of long term debt with proceeds from term loan of $21,000,000 and revolver loan of $4,000,000 |  | $ 25,000,000 |
Capital lease additions | $ 61,959 |  |

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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=66902209&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 Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + 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 210.5-03.5) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: 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 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=66902209&loc=d3e3602-108585 + Details
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