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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
OPERATING ACTIVITIES:      
Net loss attributable to the Company $ (62,669,682) $ (31,862,454) $ (27,453,954)
Depreciation of property, plant and equipment, and investment in leased property 1,907,940 2,069,672 2,132,117
Amortization of intangible assets 2,270,858 2,306,489 2,322,876
Stock-based compensation 2,180,869 2,001,840 1,452,259
Gain on sale of equity interest in joint venture (3,234,717) 0 0
Loss on disposal of property, plant and equipment 65,899 51,975 308,621
Loss (gain) on sale of leased assets 0 20,068 (673,358)
Realized loss on available for sale securities 0 0 22,421
Change in fair value of common stock warrant liability 37,101,818 (4,845,165) (3,447,153)
Changes in operating assets and liabilities that provide (use) cash:      
Accounts receivable (2,407,675) 9,367,539 (9,192,901)
Inventory (1,855,863) (1,294,671) 1,438,195
Prepaid expenses and other current assets 137,598 (94,443) (310,089)
Note receivable 60,752 (570,697) 0
Accounts payable, accrued expenses, product warranty reserve and other liabilities (2,140,157) 914,388 (1,101,356)
Deferred revenue 1,701,549 1,770,463 1,192,255
Net cash used in operating activities (26,880,811) (20,164,996) (33,310,067)
Proceeds from sale of equity interest in joint venture 3,234,717 0 0
Purchase of property, plant and equipment (111,032) (77,527) (1,326,144)
Restricted cash 0 0 525,000
Proceeds from disposal of property, plant and equipment 84,250 63,605 46,650
Proceeds from sale of leased assets 0 0 673,358
Proceeds from maturities and sales of available-for-sale securities 0 0 10,399,396
Net cash provided by (used in) investing activities 3,207,935 (13,922) 10,318,260
Change in restricted cash (500,000) 0 0
Purchase of treasury stock 0 0 (158,492)
Proceeds from exercise of warrants 6,103,096 0 0
Proceeds from issuance of preferred stock 2,595,400 0 0
Preferred stock issuance costs (224,320) 0 0
Proceeds from issuance of common stock and warrants 14,807,718 17,192,500 22,583,877
Common stock issuance costs (1,934,265) (1,402,230) (1,891,378)
Repayment of borrowings under line of credit (3,380,835) (2,024,275) 5,405,110
Proceeds from finance obligation 2,600,000 2,105,282 0
Principal payments on obligations under capital lease and finance obligation (698,674) (170,222) (9,956)
Net cash provided by financing activities 19,368,120 15,701,055 25,929,161
Effect of exchange rate changes on cash (48,780) 1,029 (35,864)
Increase (decrease) in cash and cash equivalents (4,353,536) (4,476,834) 2,901,490
Cash and cash equivalents, beginning of year 9,380,059 13,856,893 10,955,403
Cash and cash equivalents, end of year $ 5,026,523 $ 9,380,059 $ 13,856,893