Consolidated Statements of Changes in Stockholders' (Deficit) Equity (USD $)
Common Stock [Member]
Conversion of Preferred Stock Into Common Stock [Member]
Common Stock [Member]
Conversion of Warrants Into Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Preferred Stock Into Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Warrants Into Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Conversion of Preferred Stock Into Common Stock [Member]
Total
Balance at Dec. 31, 2011     $ 122     $ 29,413,821 $ 85,782 $ (128,828,989) $ 2,974,158   $ (96,355,106)
Balance (in Shares) at Dec. 31, 2011     122,345                
Issuance of restricted stock           14,550         14,550
Issuance of options to nonemployees           561         561
Stock-based compensation           1,042,989         1,042,989
Conversion of preferred stock into common stock 105     8,067,829           8,067,934  
Conversion of preferred stock into common stock (in Shares) 104,494                    
Accretion of preferred stock           (351,371)         (351,371)
Adjustment to additional paid in capital           17,306,478         17,306,478
Extinguishment of preferred shares               12,357,634     12,357,634
Purchase of noncontrolling interest’s shares           2,974,158     (2,974,158)    
Cumulative translation adjustment             (180,049)       (180,049)
Net loss               (10,471,330)     (10,471,330)
Balance at Dec. 31, 2012     227     58,469,015 (94,267) (126,942,685)     (68,567,710)
Balance (in Shares) at Dec. 31, 2012     226,839                
Exercise of common stock options     2     5,791         5,793
Exercise of common stock options (in Shares)     1,379                
Issuance of restricted stock     7     16,493         16,500
Issuance of restricted stock (in Shares)     7,571                
Issuance of common warrants           618,155         618,155
Shares issued (in Shares)     (7)                
Surrender of shares (in Shares)     (75)                
Stock-based compensation           1,053,163         1,053,163
Reversal of prior accretion           5,657,638         5,657,638
Accretion of preferred stock           (884,647)         4,772,991
Exchange of preferred shares           (14,726,088)         (14,726,088)
Reduction of liquidation value           24,980,430         24,980,430
Cumulative translation adjustment             (8,264)       (8,264)
Net loss               (23,921,563)     (23,921,563)
Balance at Dec. 31, 2013     236     75,189,950 (102,531) (150,864,248)     (75,776,593)
Balance (in Shares) at Dec. 31, 2013     235,707               235,707
Exercise of common stock options     3     12,807         12,810
Exercise of common stock options (in Shares)     3,050               3,050
Shares issued     6,229     49,823,571         49,829,800
Shares issued (in Shares)     6,228,725                
Common stock issuance costs           (6,391,588)         (6,391,588)
Stock-based compensation           3,013,284         3,013,284
Conversion of preferred stock into common stock 13,188 1   114,514,267 (1)         114,527,455  
Conversion of preferred stock into common stock (in Shares) 13,188,251 1,679                  
Accretion of preferred stock           (863,226)         (863,226)
Adjustment to additional paid in capital           328,110         328,110
Cumulative translation adjustment             (10,382)       (10,382)
Unrealized loss on short-term investments             (11,928)       (11,928)
Net loss               (53,305,938)     (53,305,938)
Balance at Dec. 31, 2014     $ 19,657     $ 235,627,174 $ (124,841) $ (204,170,186)     $ 31,351,804
Balance (in Shares) at Dec. 31, 2014     19,657,412               19,657,412