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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (24,526,756) $ (23,503,057)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,688,715 1,878,363
Stock-based compensation 3,878,619 2,990,157
Foreign currency losses 269,239 400,542
Provision for Doubtful Accounts (333,889) 0
Unrealized gain on investments (2,849,816) (274,000)
Deferred income taxes 70,803 (1,170,017)
Other non-cash items 519,027 781,927
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 1,504,218 71,400
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract 1,619,875 0
Inventory (1,551,859) (2,519,197)
Prepaid expenses and other current assets 144,421 13,345
Accounts payable and accrued expenses (664,524) 1,743,215
Billings in excess of revenue earned 49,174 (253,480)
Net cash used in operating activities (20,182,753) (19,840,802)
Cash flows provided by investing activities:    
Other assets (7,616) (79,916)
Capital expenditures (959,488) (1,341,744)
Proceeds from sale of marketable debt securities 21,858,785 33,395,422
Payments to Acquire Equity Method Investments (1,000,000) 0
Purchase of marketable debt securities (4,910,630) (22,974,668)
Cash paid for acquisition, net of cash acquired 0 (3,690,047)
Net cash provided by investing activities 14,981,051 5,309,047
Cash flows (used in) provided by financing activities:    
Proceeds from Sale of Treasury Stock 0 24,664,250
Payments Related to Tax Withholding for Share-based Compensation 11,403 0
Net Cash Provided by (Used in) Financing Activities (11,403) 24,664,250
Effect of exchange rate changes on cash (268,074) (72,436)
Net (decrease) increase in cash and cash equivalents (5,481,179) 10,060,059
Cash and equivalents:    
Beginning of period 24,848,227 25,882,554
End of period 19,367,048  
Supplemental disclosure of cash flow information:    
Income taxes paid $ 1,300,000 $ 0