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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Cash flows from operating activities:    
Net loss $ (5,472,104) $ (7,939,879)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 554,967 443,174
Stock-based compensation 1,399,415 1,292,105
Foreign currency (gains) losses (218,943) 1,190,199
Provision for Doubtful Accounts (136,095) 0
Unrealized gain on investments (2,849,816) (274,000)
Deferred income taxes 0 (1,168,962)
Other non-cash items 442,691 157,140
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 1,461,884 (210,823)
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract 1,124,634 0
Inventory (198,961) (249,340)
Prepaid expenses and other current assets 98,008 (22,082)
Accounts payable and accrued expenses (2,644,054) 10,736
Billings in excess of revenue earned 379,330 152,797
Net cash used in operating activities (6,059,044) (6,618,935)
Cash flows from investing activities:    
Other assets (87,632) (12,346)
Capital expenditures (553,793) (297,983)
Proceeds from sale of marketable debt securities 6,909,855 13,519,291
Payments to Acquire Equity Method Investments (1,000,000) 0
Purchase of marketable debt securities 0 (948,637)
Cash paid for acquisition, net of cash acquired 0 (3,247,397)
Net cash provided by investing activities 5,268,430 9,012,928
Cash flows from financing activities:    
Effect of exchange rate changes on cash 110,287 176,578
Net (decrease) increase in cash and cash equivalents (680,327) 2,570,571
Cash and equivalents:    
Beginning of period 24,848,227 18,393,066
End of period 24,167,900  
Supplemental disclosure of cash flow information:    
Income taxes paid $ 1,429,000 $ 0