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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Cash flows from operating activities:      
Net loss $ (29,374,222) $ (34,482,492) $ (25,380,115)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 792,221 1,958,680 2,501,891
Accretion of premium or discount on marketable debt securities 21,838 15,948 41,364
Stock-based compensation 2,057,400 4,791,054 2,296,131
Net (gain)/loss on investment transactions 3,858,453 (2,849,816) (2,000,000)
Income taxes 105,036 4,185 (2,421,040)
Foreign currency (gains) losses (220,015) (1,096,487) 893,260
Loss on sale of property and plant 508,833 51,159 0
Impairment of assets 0 2,526,669  
Impairment of goodwill 331,344 1,417,470 600,086
Change in allowance for bad debt 633,131 (155,000) 13,000
Inventory Write-down 1,834,300 832,615 654,694
Change in warranty reserves (62,107) (79,633) 142,328
Changes in assets and liabilities:      
Accounts receivable (3,944,859) 853,163 (2,376,593)
Contract assets and unbilled receivables 2,168,581 865,474  
Inventory (792,165) (1,656,196) (1,633,027)
Prepaid expenses, other current assets and other assets 821,340 113,015 (1,084,146)
Accounts payable and accrued expenses (163,084) (1,208,848) 1,924,751
Billings in excess of revenue earned 397,121 (4,742) (85,282)
Net cash used in operating activities (21,026,854) (28,103,782) (25,912,698)
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 7,454,139 26,646,078 37,536,004
Purchase of marketable debt securities 0 (5,697,329) (19,633,903)
Cash paid for acquisition, net of cash acquired 0 0 (3,690,047)
Payments to Acquire Equity Method Investments (2,500,000) (1,000,000.0)  
Other assets (41,031) (8,373) (140,860)
Capital expenditures (170,186) (1,183,131) (2,794,467)
Net cash provided by investing activities 4,742,922 18,757,245 11,276,727
Cash flows from financing activities:      
Sale of unregistered stock   0 24,664,250
Settlements of restricted stock for tax withholding obligations (45,513) (208,015) (771,323)
Distribution to noncontrolling interest holder 0 (699,105) (791,737)
Net cash provided by (used in) financing activities 7,993,016 (907,120) 23,101,190
Effect of exchange rate changes on cash (6,184) (268,223) 560,513
Net (decrease) increase in cash and cash equivalents (8,297,100) (10,521,880) 9,025,732
Cash and cash equivalents at beginning of year 14,326,347 24,848,227 15,822,495
Cash and cash equivalents at end of year 6,029,247 14,326,347 24,848,227
Supplemental disclosure of cash flow information:      
Income taxes paid 0 1,374,000 281,000
Construction in progress included in accrued expenses 0 $ 0 $ 212,000
Proceeds from Issuance of Common Stock $ 8,038,529