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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (9,561,405) $ (9,350,701)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 276,997 269,604
Stock-based compensation 1,852,426 1,308,894
Amortization of debt discount and issuance costs 6,331 42,206
Gain on disposal of fixed assets   (148,713)
Change in fair value of warrant liability (278,228) 347,330
Changes in operating assets and liabilities:    
Trade receivables   138,071
Accrued interest and other receivables 22,581 85,317
Prepaid and other current assets 46,850 46,312
Accounts payable and accrued expenses (1,571,391) (1,630,659)
Deferred revenue (4,206) (4,206)
Deferred rent (25,986) (10,670)
Net cash used in operating activities (9,236,031) (8,907,215)
Cash flows from investing activities:    
Purchases of property, plant and equipment (5,934) (221,782)
Proceeds from sale of property, plant and equipment   148,713
Net cash used in investing activities (5,934) (73,069)
Cash flows from financing activities:    
Proceeds from the issuance of common stock, net of issuance costs 7,102,225  
Payments related to net share issuance of stock based awards (225,311) (142,683)
Repayment of capital lease obligations (6,590) (5,573)
Repayment of loan payable (1,064,177) (1,681,664)
Net cash provided by (used in) financing activities 5,806,147 (1,829,920)
Decrease in cash and cash equivalents (3,435,818) (10,810,204)
Effects of foreign exchange rate changes on cash (352) (31,498)
Cash and cash equivalents, beginning of period 12,110,565 24,987,603
Cash and cash equivalents, end of period 8,674,395 14,145,901
Supplemental disclosure of cash flow information:    
Interest paid $ 16,598 $ 78,508