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v3.8.0.1

Unaudited Condensed Statements of Cash Flows - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net income (loss) | $ (1,105,791) | $ 385,090
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |
Depreciation | 121,417 | 115,447
Amortization | 169,346 | 97,346
Amortization of discounts on investments, net | (8,280) |
Stock-based compensation | 358,896 | 73,475
Deferred tax liability | 2,592 | 9,834
Changes in operating assets and liabilities: |  |
Trade accounts receivable | 238,085 | (2,357,941)
Inventory | 222,869 | 38,494
Prepaid expenses and other assets | (510,637) | (75,203)
Accounts payable | 246,723 | 42,917
Accrued bonus | (1,505,593) | (1,149,076)
Accrued liabilities | (40,555) | (268,306)
Deferred obligation under operating lease | (15,678) | (30,739)
Net cash used in operating activities | (1,826,606) | (3,118,662)
Cash flows from investing activities: |  |
Purchases of available-for-sale securities | (3,724,200) |
Maturities of available-for-sale securities | 7,500,000 |
Purchases of property and equipment | (503,214) | (119,312)
Net cash provided by (used in) investing activities | 3,272,586 | (119,312)
Cash flows from financing activities: |  |
Repayment of notes payable | (333,333) | (388,563)
Reversal of costs related to initial public offering |  | 781
Common stock repurchases | (779,913) |
Proceeds from exercise of stock options | 103,705 | 323,651
Net cash used in financing activities | (1,009,541) | (64,131)
Net increase (decrease) in cash and cash equivalents | 436,439 | (3,302,105)
Cash and cash equivalents, beginning of period | 15,026,068 | 45,161,403
Cash and cash equivalents, end of period | 15,462,507 | 41,859,298
Supplemental disclosure of cash flow information |  |
Interest paid | 15,340 | $ 32,508
Taxes paid | $ 7,409 |

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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