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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (6,416,447) $ (10,229,439)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 239,550 271,397
Stock-based compensation 686,582 736,545
Gain on disposal of fixed assets (38,500)  
Change in fair value of warrant liability 188,607 4,941,177
Changes in operating assets and liabilities:    
Other receivables (53,784) 20,921
Trade receivables 41,601 (44,791)
Prepaid and other current assets 97,752 134,673
Other assets, non-current (112,386) 8,081
Accounts payable and accrued expenses (798,212) (1,163,949)
Accrued wind-down expenses (474,002) (315,466)
Deferred revenue (28,399) (8,859)
Deferred rent 15,575 19,031
Net cash used in operating activities (6,652,063) (5,630,679)
Cash flows from investing activities:    
Purchase of marketable securities (471,392) (2,076,356)
Proceeds from the sale and maturity of marketable securities 4,556,000 3,212,000
Purchases of property, plant and equipment (319,915) (4,300)
Proceeds from sale of property, plant and equipment 38,500  
Acquisition of other assets (100,000)  
Net cash provided by investing activities 3,703,193 1,131,344
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 447,715 728,623
Payments related to net share issuance of stock based awards (248,589) (13,536)
Repayment of capital lease obligations (1,676) (17,979)
Repayment of bonds payable (50,000) (46,250)
Net cash provided by financing activities 1,715,628 650,858
Decrease in cash and cash equivalents (1,233,242) (3,848,477)
Effects of foreign exchange rate changes on cash (6,955) (8,031)
Cash and cash equivalents, beginning of period 8,471,275 13,311,261
Cash and cash equivalents, end of period 7,231,078 9,454,753
Supplemental disclosure of cash flow information:    
Interest paid $ 10,148 $ 14,447