Earnings per share (Details) (USD $)
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1 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
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Jul. 31, 2012
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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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 |