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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Cash flows from operating activities:    
Net (loss) income $ (22,062,298) $ (24,526,756)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 597,091 1,688,715
Stock-based compensation 1,805,999 3,878,619
Foreign currency (gains) losses 32,483 269,239
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) (56,997) (333,889)
Unrealized gain on investments (768,000) (2,849,816)
Deferred income taxes 78,777 70,803
Loss on disposal of plant and equipment 487,284 0
Goodwill, Impairment Loss 331,344  
Write-off of excess inventory 2,682,397 0
Other non-cash items 94,444 519,027
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable (1,786,687) 1,504,218
Contract assets 2,043,724 1,619,875
Inventory (1,338,233) (1,551,859)
Prepaid expenses and other current assets 436,575 144,421
Accounts payable and accrued expenses (427,603) (664,524)
Contract liabilities and billings in excess of revenue earned 1,034,608 49,174
Net cash used in operating activities (16,815,092) (20,182,753)
Cash flows provided by investing activities:    
Other assets (106,524) (7,616)
Capital expenditures (113,009) (959,488)
Proceeds from sale of marketable debt securities 5,954,139 21,858,785
Payments to Acquire Debt Securities, Available-for-sale 0 4,910,630
Cash paid for equity investment (2,500,000) (1,000,000)
Net cash provided by investing activities 3,234,606 14,981,051
Cash flows (used in) provided by financing activities:    
Sale of registered stock 8,038,531 0
Settlements of restricted stock for tax withholding obligations 7,128 11,403
Net cash provided by financing activities 8,031,403 (11,403)
Effect of exchange rate changes on cash (19,565) (268,074)
Net decrease in cash and cash equivalents (5,568,648) (5,481,179)
Cash and cash equivalents:    
Beginning of period 14,326,347 24,848,227
End of period 8,757,699 19,367,048
Supplemental disclosure of cash flow information:    
Income taxes paid $ 0 $ 1,300,000