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Statements of Cash Flows (Unaudited) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ (2,716,284) $ 2,826,238
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 98,166 166,262
Stock-based compensation 184,486 414,722
Inventory Write-down 2,595,884 0
Changes in operating assets and liabilities:    
Accounts receivable 558,968 786,986
Inventories (357,673) (454,779)
Increase (Decrease) In Collaboration Receivable (1,174,092) 0
Prepaid expenses and other current and long-term assets 189,092 425,242
Accounts payable (659,538) 417,930
Accrued expenses 115,752 (146,454)
Increase (Decrease) in Accrued Product Returns (438,352) (852,596)
Increase (Decrease) in Contract with Customer, Liability (1,956,522) 0
Net Cash Provided by (Used in) Operating Activities (3,560,113) 3,583,551
Cash flows from investing activities:    
Purchases of fixed assets (41,177) (105,888)
Net Cash Provided by (Used in) Investing Activities (41,177) (105,888)
Cash flows from financing activities:    
Net proceeds from issuance of stock and warrants 7,497 9,254
Net Cash Provided by (Used in) Financing Activities 7,497 9,254
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (3,593,793) 3,486,917
Cash and cash equivalents, end of period 3,186,636  
Supplemental disclosure of cash flow information:    
Common stock issued to settle employee incentive compensation obligation 0 294,264
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 3,186,636 $ 7,530,598