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BASIS OF PRESENTATION - Effects of Restatement on Consolidated Statements of Operations and Cash Flows (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 29, 2012
Sep. 24, 2011
Revenues:        
Net product revenues $ 21,013,668 $ 28,512,486 $ 67,449,979 $ 91,031,145
Research and development revenues 926,690 1,053,964 2,585,900 4,900,754
Total revenues 21,940,358 29,566,450 70,035,879 95,931,899
Expenses:        
Cost of product revenues 15,834,791 19,753,495 49,714,995 60,813,990
Research and development 6,399,053 6,381,089 16,519,193 19,905,398
Selling, general and administration 5,466,289 4,351,794 15,591,101 13,494,589
Total expenses 27,700,133 30,486,378 83,530,059 94,213,977
(Loss) income from operations (5,759,775) (919,928) (13,494,180) 1,717,922
Other income and expense:        
Interest income 300,690 357,581 829,028 986,888
Other income net 148,845 190,453 290,114 190,212
Foreign currency gains (525,674) 1,012,555 (656,334) 374,519
Gain on sale of investments 0 0 856,170 368,641
Impairment of marketable debt securities 0 150,644 0 150,644
Gain on sale of patents 0 0 0 155,658
Total other income and expense (633,733) 1,409,945 761,384 1,925,274
Income (loss) before provision for income taxes, equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest (6,393,508) 490,017 (12,732,796) 3,643,196
Tax provision (470,500) (97,500) (1,335,500) (293,000)
Income (loss) before equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest (6,864,008) 392,517 (14,068,296) 3,350,196
Equity losses in unconsolidated affiliates (202,278) (49,596) (592,480) (203,834)
Net income (loss) (7,066,286) 342,921 (14,660,776) 3,146,362
Net (income) loss attributable to the noncontrolling interest 344,274 (185,461) 160,300 (118,861)
Net income (loss) attributable to the controlling interest (6,722,012) 157,460 (14,500,476) 3,027,501
Net income per share:        
Basic $ (0.11) $ 0.00 $ (0.23) $ 0.05
Diluted $ (0.11) $ 0.00 $ (0.23) $ 0.05
Weighted average number of common shares:        
Basic 63,415,345 64,292,212 63,572,753 64,519,225
Diluted 63,415,345 65,441,378 63,572,753 65,623,807
Increase (decrease) in inventories     (297,273) (2,862,935)
Comprehensive (loss) income attributable to controlling interest (5,521,878) (4,120,437) (12,265,899) (1,131,807)
As previously reported
        
Revenues:        
Net product revenues   28,512,000   91,031,000
Research and development revenues   1,054,000   4,901,000
Total revenues   29,566,000   95,932,000
Expenses:        
Cost of product revenues   19,046,000   60,107,000
Research and development   6,381,000   19,905,000
Selling, general and administration   4,352,000   13,495,000
Total expenses   29,779,000   93,507,000
(Loss) income from operations   (213,000)   2,425,000
Other income and expense:        
Interest income   358,000   987,000
Other income net   190,000   190,000
Foreign currency gains   1,013,000   375,000
Gain on sale of investments   0   369,000
Impairment of marketable debt securities   151,000   151,000
Gain on sale of patents   0   156,000
Total other income and expense   1,410,000   1,926,000
Income (loss) before provision for income taxes, equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest   1,197,000   4,351,000
Tax provision   (98,000)   (293,000)
Income (loss) before equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest   1,099,000   4,058,000
Equity losses in unconsolidated affiliates   (50,000)   (204,000)
Net income (loss)   1,049,000   3,854,000
Net (income) loss attributable to the noncontrolling interest   (254,000)   (188,000)
Net income (loss) attributable to the controlling interest   795,000   3,666,000
Net income per share:        
Basic   $ 0.01   $ 0.06
Diluted   $ 0.01   $ 0.06
Weighted average number of common shares:        
Basic   64,292,000   64,519,000
Diluted   65,441,000   65,624,000
Adjustment
        
Revenues:        
Net product revenues   0   0
Research and development revenues   0   0
Total revenues   0   0
Expenses:        
Cost of product revenues   707,000   707,000
Research and development   0   0
Selling, general and administration   0   0
Total expenses   707,000   707,000
(Loss) income from operations   (707,000)   (707,000)
Other income and expense:        
Interest income   0   0
Other income net   0   0
Foreign currency gains   0   0
Gain on sale of investments   0   0
Impairment of marketable debt securities   0   0
Gain on sale of patents   0   0
Total other income and expense   0   0
Income (loss) before provision for income taxes, equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest   (707,000)   (707,000)
Tax provision   0   0
Income (loss) before equity losses in unconsolidated affiliates and net income (loss) of noncontrolling interest   (707,000)   (707,000)
Equity losses in unconsolidated affiliates   0   0
Net income (loss)   (707,000)   (707,000)
Net (income) loss attributable to the noncontrolling interest   69,000   69,000
Net income (loss) attributable to the controlling interest   (638,000)   (638,000)
Net income per share:        
Basic   $ (0.01)   $ (0.01)
Diluted   $ (0.01)   $ (0.01)
Weighted average number of common shares:        
Increase (decrease) in inventories       700,000
Comprehensive (loss) income attributable to controlling interest   $ (700,000)   $ (700,000)