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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net (loss) income $ (11,319,910) $ (5,472,104)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 264,389 554,967
Stock-based compensation 815,842 1,399,415
Foreign currency losses (233,180) (218,943)
Change in allowance for bad debt 246,970 (136,095)
Unrealized gain on investments 0 (2,849,816)
Loss on disposal of plant and equipment (180,308) 0
Write-off of excess inventory 1,253,988 442,691
Other non-cash items 32,732 0
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable (953,353) 1,461,884
Contract assets 947,986 1,124,634
Inventory (620,982) (198,961)
Prepaid expenses and other current assets 221,926 98,008
Accounts payable and accrued expenses 393,941 (2,644,054)
Billings in excess of revenue earned 922,540 379,330
Net cash used in operating activities (7,846,803) (6,059,044)
Cash flows provided by investing activities:    
Other assets (50,000) (87,632)
Capital expenditures (74,920) (553,793)
Proceeds from sale of marketable debt securities 2,789,139 6,909,855
Cash paid for equity investment 0 (1,000,000)
Net cash provided by investing activities 2,664,219 5,268,430
Cash flows (used in) provided by financing activities:    
Sale of registered stock 7,450,000 0
Settlements of restricted stock for tax withholding obligations 7,128 0
Net cash provided by financing activities 7,442,872 0
Effect of exchange rate changes on cash (3,110) 110,287
Net increase (decrease) in cash and cash equivalents 2,257,178 (680,327)
Cash and cash equivalents:    
Beginning of period 14,326,347  
End of period 16,583,525  
Supplemental disclosure of cash flow information:    
Issuance costs included in accounts payable and accrued expenses 140,000  
Income taxes paid $ 0 $ 1,429,000