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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (12,285,129) $ (9,395,917)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 471,558 521,142
Stock-based compensation 1,436,223 1,459,990
Amortization of debt discount and issuance costs 91,450  
Gain on disposal of fixed assets (34,946)  
Change in fair value of warrant liability (569,081) (1,264,780)
Changes in operating assets and liabilities:    
Accrued interest and other receivables (68,912) 46,425
Trade receivables 34,401 (64,672)
Prepaid and other current assets 76,763 103,666
Other assets, non-current (106,548) 15,581
Accounts payable and accrued expenses 1,292,596 (1,520,862)
Accrued wind-down expenses (1,102,762) (637,045)
Deferred revenue (57,758) (25,075)
Deferred rent 392,057 46,495
Net cash used in operating activities (10,430,088) (10,715,052)
Cash flows from investing activities:    
Purchase of marketable securities (549,603) (2,078,600)
Proceeds from the sale and maturity of marketable securities 13,026,000 3,662,000
Purchases of property, plant and equipment (2,420,430) (17,481)
Proceeds from sale of property, plant and equipment 38,500  
Acquisition of other assets (100,000)  
Net cash provided by investing activities 9,994,467 1,565,919
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs 4,911,627  
Proceeds from the exercise of stock options 2,086  
Proceeds from the exercise of warrants, net of issuance costs 460,762 3,194,202
Proceeds from loan payable, net of issuance costs 9,783,094  
Payments related to net share issuance of stock based awards (330,351) (29,865)
Repayment of capital lease obligations (3,382) (17,979)
Repayment of bonds payable (100,000) (92,500)
Net cash provided by financing activities 14,723,836 3,053,858
Increase (decrease) in cash and cash equivalents 14,288,215 (6,095,275)
Effects of foreign exchange rate changes on cash (6,595) (12,558)
Cash and cash equivalents, beginning of period 8,471,275 13,311,261
Cash and cash equivalents, end of period 22,752,895 7,203,428
Supplemental disclosure of cash flow information:    
Interest paid 110,266 28,622
Fair value of 329,131 shares issued as consideration under an equity financing agreement $ 600,006 [1]  
[1] In June 2013, we entered into an agreement with an institutional investor, under which we have the right to sell up to $30.0 million of common stock to the institutional investor. In consideration for entering into the agreement, we issued 329,131 shares of our common stock to the institutional investor. We will not receive any cash proceeds from the issuance of these 329,131 shares. All shares sold or to be sold under this agreement are offered under our shelf registration statement previously filed with, and declared effective by, the SEC.