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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (9,395,917) $ (9,782,428)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 521,142 612,233
Stock-based compensation 1,459,990 1,948,727
Gain on sale of marketable securities   (83,750)
Loss on disposal of fixed assets   32,093
Change in fair value of warrant liability (1,264,780) (4,803,183)
Changes in operating assets and liabilities:    
Other receivables 46,425 (281,680)
Trade receivables (64,672) 42,834
Prepaid and other current assets 103,666 (77,282)
Other assets, non-current 15,581 3,187
Accounts payable and accrued expenses (1,520,862) (896,382)
Accrued wind-down expenses (673,045) (530,553)
Deferred revenue (25,075) (30,807)
Deferred rent 46,495 716,024
Net cash used in operating activities (10,715,052) (13,130,967)
Cash flows from investing activities:    
Purchase of marketable securities (2,078,600) (9,725,332)
Proceeds from the sale and maturity of marketable securities 3,662,000 758,206
Purchases of property, plant and equipment (17,481) (116,582)
Proceeds from sale of property, plant and equipment   42,427
Net cash provided by (used in) investing activities 1,565,919 (9,041,281)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs 8,657,000 9,524,758
Proceeds from the exercise of stock options   2,386
Proceeds from the exercise of warrants, net of issuance costs 3,194,202  
Payments related to net share issuance of stock based awards (29,865) (394,096)
Repayment of capital lease obligations (17,979) (33,078)
Repayment of bonds payable (92,500) (85,000)
Net cash provided by financing activities 3,053,858 9,014,970
Decrease in cash and cash equivalents (6,095,275) (13,157,278)
Effects of foreign exchange rate changes on cash (12,558) (16,898)
Cash and cash equivalents, beginning of period 13,311,261 19,707,821
Cash and cash equivalents, end of period 7,203,428 6,533,645
Supplemental disclosure of cash flow information:    
Interest paid $ 28,622 $ 40,000