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Earnings per share (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net (loss) income per share                        
Common stock equivalents excluded from calculation of diluted earnings per share since the effect would be anti-dilutive                     600,000 1,300,000
Numerator                        
Net (loss) income   $ (17,885,963) $ (4,416,499) $ (14,586,578) $ (14,684,535) $ (6,272,044) $ (7,297,125) $ (6,068,072) $ (6,597,861) $ (51,573,575) $ (26,235,102) $ 30,904,514
Deemed dividend         18,248,768         18,248,768    
Gain on exchange of convertible preferred stock in connection with recapitalization 160,000,000       3,390,750     159,954,069   3,390,750 159,954,069  
Less beneficial conversion charge               (377,787)     (377,787)  
Less net income attributable to participating preferred stock                     (132,600,000) (30,900,000)
Net (loss) income attributable to common stockholders                   $ (66,431,593) $ 731,262 $ 26,069
Denominator                        
Denominator for basic earnings per share (in shares)                   12,829,411 3,328 1,089
Effect of dilutive securities:                        
Employee stock options (in shares)                       4,640
Series 3 convertible preferred stock (in shares)                     13,877  
Denominator for diluted earnings per share (in shares)                   12,829,411 17,205 5,729
Net (loss) income per share:                        
Basic (in dollars per share)   $ (0.75) $ (0.19) $ (5.51) $ (6,527.30) $ (1,380.13) $ (1,605.53) $ 168.00 $ (5,992.61) $ (5.18) $ 219.76 $ 23.95
Diluted (in dollars per share)   $ (0.75) $ (0.19) $ (5.51) $ (6,527.30) $ (1,380.13) $ (1,605.53) $ 48.29 $ (5,992.61) $ (5.18) $ 42.50 $ 4.55