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Consolidated Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities    
Net loss $ (4,476,200) $ (3,594,379)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation 276,346 255,548
Loss on disposal of property and equipment 1,213 0
Stock-based compensation expense 583,847 336,630
Write-off of deferred financing costs 86,736 0
Amortization of deferred rent related to lease incentives (95,248) (95,250)
Amortization of debt discount 124,797 0
Accretion and amortization on available for sale investments 1,792 81,210
(Increase) Decrease in    
Accounts receivable, trade (381,717) 109,349
Inventories (69,124) (818,159)
Prepaid expenses and other current assets (29,692) (86,405)
Increase (Decrease) in    
Accounts payable 361,900 253,647
Accrued compensation and other current liabilities (107,586) (175,482)
Accrued interest, related parties 39,524 0
Deferred rent 24,541 29,700
Net cash used in operating activities (3,658,871) (3,703,591)
Cash flows from investing activities    
Sales of available-for-sale investments 1,650,000 5,825,000
Purchases of available-for-sale investments 0 (1,409,695)
Costs associated with internal use software development (857,453) (895,062)
Purchase of property and equipment (130,118) (103,856)
Net cash provided by investing activities 662,429 3,416,387
Cash flows from financing activities    
Proceeds from related party debt 2,000,000 0
Proceeds from exercise of common stock options and warrants 278,503 99,986
Deferred costs related to potential stock issuance (86,736) 0
Net cash provided by financing activities 2,191,767 99,986
Net decrease in cash and cash equivalents (804,675) (187,218)
Cash and cash equivalents - beginning of period 2,173,258 2,538,758
Cash and cash equivalents - end of period 1,368,583 2,351,540
Non-cash investing and financing activities    
Costs incurred for capitalized internal use software not paid as of quarter end (amounts are included in liabilities) 109,500 291,960
Debt discount related to warrants $ 374,390 $ 0