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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Statement of Comprehensive Income [Abstract]        
Net loss $ (7,260,540) $ (2,854,728) $ (15,200,417) $ (9,689,515)
Other comprehensive (loss) income:        
Foreign currency translation adjustments (666,343) (92,228) 931,062 643,956
Unrealized holding gains on marketable securities 149,094 92,596 137,780 410,106
Reclassification of holding losses in net loss (2,745) (38,360) (3,900) (34,192)
Other comprehensive (loss) income (519,994) (37,992) 1,064,942 1,019,870
Comprehensive loss (7,780,534) (2,892,720) (14,135,475) (8,669,645)
Comprehensive income attributable to the noncontrolling interest (41,680) (337,788) 16,354 (468,489)
Comprehensive loss attributable to controlling interest $ (7,822,214) $ (3,230,508) $ (14,119,121) $ (9,138,134)