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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Operating Activities:            
Net income (loss) $ 1,045,940 $ (1,683,253)        
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities            
Depreciation and amortization 201,267 60,105        
Warranty provision 20,618 12,361        
Inventory obsolescence 54,854 40,301        
Share-based compensation 133,845 138,461        
Deferred income taxes 283,003 2,708,888        
Changes in operating assets and liabilities:            
Accounts receivable, net (5,916,242) 3,662        
Inventories, net (2,029,403) (43,001)        
Prepaid expenses and other 2,136,282 393,761        
Other assets 46,874        
Accounts payable (66,849) 790,635        
Payroll and related (1,047,037) (1,023,537)        
Warranty settlements (4,789) (3,154)        
Accrued and other liabilities 94,627 311,482        
Net cash (used in) provided by operating activities (5,093,884) 1,753,585        
Investing Activities:            
Purchases of marketable securities (874,353) (1,673,295)        
Proceeds from maturities of marketable securities 982,834 2,128,016        
Capital expenditures (38,813) (54,167)        
Net cash provided by investing activities 69,668 400,554        
Financing Activities:            
Proceeds from exercise of stock options 2,528 159,518        
Repurchase of common stock (1,621,022)        
Net cash (used in) provided by financing activities (1,618,494) 159,518        
Effect of foreign exchange rate on cash (9,734)        
Net (decrease) increase in cash, cash equivalents, and restricted cash (6,652,444) 2,313,657        
Cash, cash equivalents and restricted cash, beginning of period 11,806,074 12,803,887 $ 12,803,887      
Cash, cash equivalents and restricted cash, end of period 5,153,630 15,117,544 11,806,074      
Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets:            
Cash and cash equivalents       $ 4,416,106 $ 11,063,091 $ 15,117,544
Restricted cash, current portion       397,933  
Long-term restricted cash       339,591  
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 11,806,074 12,803,887 $ 11,806,074 $ 5,153,630 $ 11,806,074 $ 15,117,544
Noncash investing and financing activities:            
Change in unrealized loss on marketable securities $ (613) $ (8,031)