| Commitments and Contingencies (Details) | Dec. 31, 2016  USD ($) | 
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| Letter of Credit [Member] | USU [Member] | |
| Line of Credit Facility [Line Items] | |
| Line of credit, maximum borrowing capacity | $ 71,634 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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