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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Cash flows from operating activities:    
Net loss $ (7,768,453) $ (23,225,143)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,860,300 2,587,551
Accretion (amortization) of premium or discount on marketable debt securities 291,252 60,544
Stock-based compensation 2,786,494 3,555,454
Foreign currency (gains) losses (1,012,904) 229,430
Change in allowance for bad debt 74,500 94,019
Deferred income taxes (75,000) (102,995)
Gain on sale of investments (7,960,022) 0
Loss in unconsolidated affiliate 0 102,305
Impairment of equity and cost based investments 0 1,319,287
Gain on sale of equipment 0 (250,000)
Other non-cash items 1,405,369 245,599
Changes in assets and liabilities:    
Accounts receivable 1,398,155 (1,129,914)
Inventory 88,853 (1,096,976)
Prepaid expenses and other current assets 71,409 (217,941)
Accounts payable and accrued expenses (2,349,429) 641,685
Billings in excess of revenue earned 1,048,675 (202,185)
Net cash used in operating activities (10,140,801) (17,389,280)
Cash flows from investing activities:    
Other assets 17,063 (47,456)
Capital expenditures (993,299) (1,544,056)
Proceeds from sale of marketable debt securities 18,483,666 33,386,147
Purchase of marketable debt securities (14,465,311) (14,130,888)
Proceeds from sale of investments 7,960,022 0
Proceeds from sale of equipment 0 250,000
Net cash provided by investing activities 11,002,141 17,913,747
Net cash used in financing activities    
Treasury stock purchases 0 (298,619)
Proceeds from exercise of stock options and warrants 86,047 137,813
Settlements of restricted stock for tax withholding obligations (459,609) (56,286)
Net cash used in financing activities (373,562) (217,092)
Effect of exchange rate changes on cash (146,096) (14,958)
Net increase in cash and equivalents 341,682 292,417
Cash and equivalents:    
Beginning of period 14,635,801 16,756,666
End of period 14,977,483  
Supplemental disclosure of cash flow information:    
Income taxes paid 57,000 70,300
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 0 $ 169,500