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Business Segments and Significant Customers (Details 2)	3 Months Ended								12 Months Ended
	Mar. 31, 2013 Total revenues Customer concentration risk Customer A	Mar. 31, 2012 Total revenues Customer concentration risk Customer A	Mar. 31, 2013 Total revenues Customer concentration risk Customer B	Mar. 31, 2013 Total revenues Customer concentration risk Customer C	Mar. 31, 2012 Total revenues Customer concentration risk Customer C	Mar. 31, 2013 Total revenues Customer concentration risk Customer D	Mar. 31, 2012 Total revenues Customer concentration risk Customer D	Mar. 31, 2013 Net accounts receivable Credit concentration Two customers Item	Dec. 31, 2012 Net accounts receivable Credit concentration Three customers Item
Significant Customers
Percentage of concentration risk	33.00%	30.00%	14.00%	13.00%	26.00%	11.00%	17.00%	100.00%	100.00%
Number of customers								2	3

X

- Definition

Represents the number of customers on whom the entity relies significantly giving rise to concentration of risk.

+ References

No definition available.

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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