Quarterly report pursuant to Section 13 or 15(d)

Statements of Cash Flows

v3.10.0.1
Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (3,778,608) $ (6,278,708)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance for doubtful accounts (98,337) 273,727
Write-down of inventory 5,458 712,083
Depreciation and amortization 216,920 224,926
Write-off of capitalized patents 15,478 202,343
Write-off of fixed assets 7,055 15,036
Stock-based compensation 630,306 498,006
Decrease (increase) in operating assets:    
Accounts receivable 148,629 (100,715)
Inventories 6,498 166,529
Prepayments and other current assets (238,520) 77,981
Increase (decrease) in operating liabilities:    
Accounts payable 68,295 (133,783)
Accrued expenses 74,693 (5,627)
Net cash used in operating activities (2,942,133) (4,348,202)
Cash flows from investing activities:    
Purchase of property and equipment (18,525) (18,146)
Acquisition of intangible assets (79,188) (171,134)
Net cash used in investing activities (97,713) (189,280)
Cash flows from financing activities:    
Net proceeds from issuance of common stock 0 13,657,331
Payment of taxes related to restricted stock vesting (2,188) 0
Exercise of options and warrants 0 11,143
Net cash provided by (used in) financing activities (2,188) 13,668,474
Net increase (decrease) in cash and cash equivalents (3,042,034) 9,130,992
Cash and cash equivalents at beginning of period 10,022,247 4,204,916
Cash and cash equivalents at end of period $ 6,980,213 $ 13,335,908