Quarterly report pursuant to Section 13 or 15(d)

Statements of Cash Flows

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Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (6,028,531) $ (8,496,307)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance for doubtful accounts (98,677) 226,557
Write-down of inventory 67,515 703,220
Depreciation and amortization 297,007 339,493
Write-off of capitalized patents 15,478 268,789
Write-off of fixed assets 7,128 53,445
Stock-based compensation 837,810 833,637
Decrease (increase) in operating assets:    
Accounts receivable 40,462 (234,980)
Inventories 52,083 214,466
Prepayments and other current assets 181,906 159,366
Increase (decrease) in operating liabilities:    
Accounts payable 287,608 (59,653)
Accrued expenses (3,790) 67,722
Net cash used in operating activities (4,344,001) (5,924,245)
Cash flows from investing activities:    
Purchase of property and equipment (19,613) (44,819)
Acquisition of intangible assets (117,252) (220,865)
Net cash used in investing activities (136,865) (265,684)
Cash flows from financing activities:    
Net proceeds from issuance of stock 0 13,657,331
Payment of taxes related to stock award vesting (2,616) (1,574)
Exercise of options and warrants 0 11,143
Net cash provided by (used in) financing activities (2,616) 13,666,900
Net increase (decrease) in cash and cash equivalents (4,483,482) 7,476,971
Cash and cash equivalents at beginning of period 10,022,247 4,204,916
Cash and cash equivalents at end of period $ 5,538,765 $ 11,681,887