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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Cash flows from operating activities:    
Net loss $ (15,200,417) $ (9,689,515)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,142,506 651,687
Accretion of premium or discount on marketable debt securities 38,848 78,261
Stock-based compensation 1,968,128 951,053
Foreign currency losses 656,613 563,548
Change in allowance for bad debt 0 (17,644)
Unrealized gain on warrant (274,000) 0
Deferred income taxes (1,169,940) 1,363,000
Gain on sale of property and plant 0 (7,700,522)
Other non-cash items 452,199 244,956
Change in warranty reserves 117,625 0
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 241,213 145,076
Inventory (778,240) (696,705)
Prepaid expenses and other current assets (275,988) 295,257
Accounts payable and accrued expenses 358,388 1,682,820
Billings in excess of revenue earned 45,466 (152,872)
Net cash used in operating activities (12,677,599) (12,281,600)
Cash flows from investing activities:    
Other assets (37,296) (187,646)
Capital expenditures (1,071,742) (305,059)
Proceeds from sale of marketable debt securities 24,615,971 30,488,413
Purchase of marketable debt securities (16,812,114) (35,064,288)
Proceeds from sale of property and plant 0 8,106,819
Cash paid for acquisition, net of cash acquired (3,690,047) 0
Proceeds from sale of III-V product line 0 15,000,000
Net cash provided by investing activities 3,004,772 18,038,239
Cash flows from financing activities:    
Sale of unregistered stock 24,664,250 0
Settlements of restricted stock for tax withholding obligations 0 (1,500)
Net cash provided by (used in) financing activities 24,664,250 (1,500)
Effect of exchange rate changes on cash (272,625) 203,402
Net increase in cash and equivalents 14,718,798 5,958,541
Cash and equivalents:    
Beginning of period 15,822,495 19,767,889
End of period $ 30,541,293 $ 25,726,430