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Related Party Transactions (Details) (USD $)	1 Months Ended	3 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended	6 Months Ended
Related Party Transactions (Details) (USD $)	Apr. 30, 2012 Unsecured subordinated promissory notes Working Capital Guarantee Credit Agreement	Jun. 30, 2011 Unsecured subordinated promissory notes Working Capital Guarantee Credit Agreement	Jun. 30, 2010 ZM Private Equity Fund I and II, L.P. Second Lien Credit Agreement	Jun. 29, 2010 ZM Private Equity Fund I and II, L.P. Second Lien Credit Agreement	Apr. 30, 2012 ZM Private Equity Fund I and II, L.P. Unsecured subordinated promissory notes	Jun. 30, 2010 ZM Private Equity Fund I and II, L.P. Unsecured subordinated promissory notes	Apr. 30, 2012 ZM Private Equity Fund I and II, L.P. Unsecured subordinated promissory notes Working Capital Guarantee Credit Agreement	Jun. 30, 2011 ZM Private Equity Fund I and II, L.P. Unsecured subordinated promissory notes Working Capital Guarantee Credit Agreement	Jun. 30, 2011 ZM Private Equity Fund I and II, L.P. Unsecured subordinated promissory notes Amendment to the Credit Agreement
Related Party Transactions
Debt instrument, amount borrowed								$ 1,000,000	$ 10,000,000
Interest rate (as a percent)	10.00%	20.00%			10.00%	20.00%	10.00%	20.00%	20.00%
Debt instrument, amount outstanding				20,000,000
Repayment of debt instrument			11,500,000
Debt instrument exchanged						$ 8,500,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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