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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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- Definition Class of Warrant or Right, Number of Warrants Converted to Common Stock + References No definition available. + Details
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- Definition 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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