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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss attributable to common stockholders $ (250,404) $ (1,994,461)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Deferred benefit for income taxes (910,959) (275,949)
Loss on foreign currency transactions   18,647
Gain on disposal of property and equipment (1,542) (89,168)
Provision for bad debt 10,950 495
Impairment of goodwill   1,697,394
Warranty reserves (723) 3,982
Amortization of deferred gain (53,838) (45,316)
Depreciation 688,727 430,347
Amortization of intangibles 520,035 809,540
Inventory reserves 382,472 191,012
Amortization of debt discount 249,882 13,786
Stock-based compensation expense 503,419 490,140
Changes in operating assets and liabilities:    
Accounts receivable 1,971,324 1,220,504
Inventories (2,872,108) (1,664,165)
Prepaid expenses and other current assets (294,475) (106,598)
Accounts payable (484,327) (60,607)
Accrued expenses and other liabilities (843,823) (251,236)
Net cash (used in) provided by operating activities (1,385,390) 388,347
Cash flows from investing activities:    
Purchases of property and equipment, including capitalization of labor costs for test equipment and ERP (664,385) (2,061,762)
Proceeds from sales of property and equipment 1,542 1,050
Net cash used in investing activities (662,843) (2,060,712)
Cash flows from financing activities:    
Proceeds from issuance of stock and stock options exercised 124,467 29,149
Payment of payroll taxes on net issuance of employee stock options (684,446) (132,017)
Proceeds from issuance of common stock   2,700,714
Stock issuance costs   (212,566)
Net (repayments) borrowings on bank lines of credit (23,622) 62,519
Borrowings on related-party notes payable   1,150,000
Borrowings on notes payable   374,623
Repayments on related-party notes payable (433,094) (312,691)
Repayments on notes payable (131,792)  
Proceeds on senior secured convertible note 2,383,726  
Repayments on senior secured convertible note (409,090)  
Proceeds on Paycheck Protection Program (PPP) note payable 1,499,360  
Net cash provided by financing activities 2,325,509 3,659,731
Net change in cash and cash equivalents 277,276 1,987,366
Effect of exchange rates on cash 57,232 (33,421)
Cash and cash equivalents, beginning of period 5,185,321 2,272,256
Cash and cash equivalents, end of period 5,519,829 4,226,201
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest 202,022 111,463
Cash paid during the period for income taxes 228,129 4,000
Supplemental disclosure of non-cash flow transactions:    
Original issue discount on senior secured convertible note 300,000  
Forward foreign currency contracts   53,904
Reclassification of inventories to property and equipment $ 157,133 67,948
Relative fair value of warrants issued in connection with notes and related party notes payable   $ 60,158