v2.4.0.6

Summary of significant accounting policies (Details 5) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 03, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 CCDG | Dec. 31, 2011 CCDG | Dec. 31, 2010 CCDG | Dec. 31, 2009 CCDG
Non-controlling interests |  |  |  |  |  |  |  |
Percentage of net profits less capital expenditures of the preceding year allocated to non-controlling interest holders |  |  |  |  | 30.00% |  |  |
Distributions to non-controlling interest holders |  | $ 678,000 | $ 547,000 | $ 398,000 |  |  |  |
Initial term of Detroit Operating Agreement |  |  |  |  | 7 years |  |  |
Optional extension period of Detroit Operating Agreement |  |  |  |  | 4 years |  |  |
Amount of annual fixed distribution per year under Detroit Operating Agreement |  |  |  |  | 121,000 | 85,000 | 85,000 |
Non-controlling owners capital account amount |  | $ 823,000 | $ 197,000 |  |  |  |  | $ 0
Convertible preferred stock |  |  |  |  |  |  |  |
Preferred stock issued (in shares) |  | 0 | 0 |  |  |  |  |
Preferred stock outstanding (in shares) |  | 0 | 0 |  |  |  |  |
Warrants exercisable into convertible preferred stock |  |  |  |  |  |  |  |
Preferred stock warrants outstanding (in shares) | 25,196 |  |  |  |  |  |  |
Issuance of common stock upon exercise and conversion of preferred stock warrants (in shares) | 20,172 |  |  |  |  |  |  |

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- Definition The cash outflow to return capital to noncontrolled interest, which generally occurs when noncontrolling shareholders reduce their ownership stake (in a subsidiary of the entity). This element does not include dividends paid to noncontrolling shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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