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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net loss $ (7,620,256) $ (6,416,447)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 335,855 239,550
Stock-based compensation 521,106 686,582
Amortization of debt discount and issuance costs 72,836  
Gain on disposal of fixed assets   (38,500)
Change in fair value of warrant liability 326,624 188,607
Changes in operating assets and liabilities:    
Trade receivables 8,662 41,601
Accrued interest and other receivables 387,686 (53,784)
Prepaid and other current assets 102,895 97,752
Other assets, non-current   (112,386)
Accounts payable and accrued expenses (637,190) (798,212)
Accrued wind-down expenses   (474,002)
Deferred revenue (10,340) (28,399)
Deferred rent 4,576 15,575
Net cash used in operating activities (6,507,546) (6,652,063)
Cash flows from investing activities:    
Purchase of marketable securities   (471,392)
Proceeds from the maturity of marketable securities   4,556,000
Purchases of property, plant and equipment (230,689) (319,915)
Proceeds from sale of property, plant and equipment   38,500
Acquisition of other assets   (100,000)
Net cash provided by (used in) investing activities (230,689) 3,703,193
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs   1,568,178
Proceeds from the exercise of warrants, net of issuance costs   447,715
Proceeds from loan payable 3,820,264  
Payments related to net share issuance of stock based awards (201,462) (248,589)
Repayment of capital lease obligations (5,186) (1,676)
Repayment of loan payable (998,089) (50,000)
Net cash provided by financing activities 2,615,527 1,715,628
Decrease in cash and cash equivalents (4,122,708) (1,233,242)
Effects of foreign exchange rate changes on cash 909 (6,955)
Cash and cash equivalents, beginning of period 30,585,424 8,471,275
Cash and cash equivalents, end of period 26,463,625 7,231,078
Supplemental disclosure of cash flow information:    
Interest paid $ 141,249 $ 10,148