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Stockholders' equity and employee benefit plans (Warrants) (Details) (USD $)	12 Months Ended		12 Months Ended	1 Months Ended
	Dec. 31, 2013	Apr. 17, 2012	Dec. 31, 2013 Warrants [Member]	Aug. 31, 2010 Warrants [Member] Warrants Issued in August 2010 [Member]	Jun. 30, 2011 Warrants [Member] Warrants Issued in August 2010 [Member]	Jun. 30, 2011 Warrants [Member] Warrants Issued in June 2011 [Member]	Aug. 31, 2010 Warrants [Member] Warrants Issued in June 2011 [Member]
Class of Warrant or Right [Line Items]
Share price (in dollars per share)		$ 20.00		$ 7.68	$ 8.07
Exercise price monthly increase				0.50%
Number of shares called by warrants				0.5			0.5
Fair value assumptions, exercise price (in dollars per share)				$ 1.94		$ 6.19
Number of warrants converted to common stock (in shares)	6,366,072
Stock issued during the period (in shares)			4,227,358
Warrants outstanding (in shares)	355,000

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Class of Warrant or Right, Exercise Price Monthly Increase

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

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Agreed upon price for the exchange of the underlying asset.

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Price of a single share of a number of saleable stocks of a company.

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