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Statements of Cash Flows (Unaudited) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities    
Net income $ 2,373,429 $ (1,957,220)
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Depreciation 244,927 259,895
Stock-based compensation expense 1,130,945 957,711
Stock issued for services 71,250
Write-off of deferred financing costs 67,664
Amortization of deferred rent related to lease incentives (95,248) (95,249)
Amortization of debt discount 155,996
Loss from equity-method investment in SAVSU 363,243 707,208
Change in operating assets and liabilities    
Accounts receivable, trade (1,678,027) (159,851)
Inventories (1,064,181) (103,274)
Prepaid expenses and other current assets (48,606) (101,479)
Accounts payable 342,875 (227,732)
Accrued compensation and other current liabilities 204,653 138,885
Accrued interest 152,143
Deferred rent (11,490) (63,836)
Net cash provided by (used in) operating activities 1,762,520 (197,889)
Cash flows from investing activities    
Investment in SAVSU (6,000,000)
Purchase of property and equipment (339,068) (91,443)
Net cash used in investing activities (6,339,068) (91,443)
Cash flows from financing activities    
Proceeds from private equity transaction 19,999,994
Proceeds from related party debt 1,000,000
Payments on equipment loan (9,267) (10,628)
Payments on capital lease obligations (9,812) (7,631)
Proceeds from exercise of common stock options and warrants 11,724,247 784,273
Payments of preferred stock dividends (305,758)
Payments of costs related to stock issuances (42,500) (9,303)
Payments for redemption of preferred stock (1,063,000)
Deferred costs related to potential stock issuance (42,664)
Net cash provided by financing activities 30,293,904 1,714,047
Net increase in cash and cash equivalents 25,717,356 1,424,715
Cash and cash equivalents - beginning of period 6,663,318 1,405,826
Cash and cash equivalents - end of period 32,380,674 2,830,541
Non-cash investing and financing activities    
Series A preferred stock dividends accrued not yet paid 79,675 106,250
Stock issued for services provided in prior period included in liabilities at year-end 35,625 35,624
Receivables converted to equity investment in SAVSU 150,103
Preferred stock issued on conversion of related party note payable and accrued interest 4,250,000
Capital lease obligations incurred for purchases of equipment 52,327
Purchase of equipment with debt 17,604 39,243
Legal fees for private equity transaction not yet paid 42,500
Purchase of property and equipment not yet paid $ 49,101