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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Cash flows from operating activities:    
Net loss $ (14,718,777) $ (15,200,417)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,130,169 1,142,506
Stock-based compensation 2,687,789 1,968,128
Foreign currency losses 19,534 656,613
Provision for Doubtful Accounts 219,937 0
Unrealized gain on investments (2,849,816) (274,000)
Deferred income taxes 196,252 (1,169,940)
Other non-cash items 301,499 608,672
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 687,986 241,213
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract 1,315,022 0
Inventory (605,154) (778,240)
Prepaid expenses and other current assets 113,537 (275,988)
Accounts payable and accrued expenses (2,018,182) 358,388
Billings in excess of revenue earned 312,352 45,466
Net cash used in operating activities (13,207,852) (12,677,599)
Cash flows from investing activities:    
Other assets (41,966) (37,296)
Capital expenditures (740,172) (1,071,742)
Proceeds from sale of marketable debt securities 13,109,285 24,322,300
Payments to Acquire Equity Method Investments (1,000,000) 0
Purchase of marketable debt securities 0 (16,812,114)
Cash paid for acquisition, net of cash acquired 0 (3,690,047)
Net cash provided by investing activities 11,327,147 2,711,101
Cash flows from financing activities:    
Proceeds from Sale of Treasury Stock 0 24,664,250
Payments Related to Tax Withholding for Share-based Compensation 11,402 0
Net Cash Provided by (Used in) Financing Activities (11,402) 24,664,250
Effect of exchange rate changes on cash (213,545) 21,046
Net (decrease) increase in cash and cash equivalents (2,105,652) 14,718,798
Cash and equivalents:    
Beginning of period 24,848,227 30,541,293
End of period 22,742,575  
Supplemental disclosure of cash flow information:    
Income taxes paid $ 1,300,000 $ 0