Stock options and warrants (Schedule of Award Activity) (Details) (USD $)	6 Months Ended
Jun. 30, 2014
Shares Underlying Options
Exercised	(39,079)
Stock Incentive Plan [Member]
Shares Underlying Options
Outstanding, beginning	1,218,265
Granted	652,100
Exercised	(39,079)
Forfeited	(36,040)
Outstanding, ending	1,795,246
Exercisable	1,134,621
Weighted Average Exercise Price
Outstanding, beginning	$ 8.70
Granted	$ 2.28
Exercised	$ 2.09
Forfeited	$ 32.29
Outstanding, ending	$ 6.04
Exercisable	$ 8.17
Weighted Average Remaining Contractual Term
Outstanding	8 years 6 months
Exercisable	8 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding	$ 164,154
Exercisble	140,863
Nonqualified [Member]
Shares Underlying Options
Outstanding, beginning	4,622,505
Granted
Exercised	(1,161,570)
Forfeited	(5,000)
Outstanding, ending	3,455,935
Weighted Average Exercise Price
Outstanding, beginning	$ 1.82
Granted
Exercised	$ 1.36
Forfeited	$ 30.00
Outstanding, ending	$ 1.93
Weighted Average Remaining Contractual Term
Outstanding	3 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding	$ 2,491,184

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iii)

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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-Publisher FASB

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-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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