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Deferred Tax (Tables) | 6 Months Ended
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Jun. 30, 2012
Deferred Tax Liability | As of June 30, 2012 and December 31, 2011, deferred tax liability consisted of the following:
|  | 2012 |  |  | 2011 |
Deferred tax asset — noncurrent (accrual of system maintenance cost) |  | $ | 38,317 |  |  | $ | 33,146 |
Deferred tax asset — noncurrent (depreciation of fixed assets) |  |  | 24,255,713 |  |  |  | 25,527,126 |
Deferred tax liability — noncurrent (net investment in sales-type leases) |  |  | (30,663,065 | ) |  |  | (31,948,809 | )
Deferred tax liability, net of deferred tax asset – noncurrent |  | $ | (6,369,035 | ) |  | $ | (6,388,537 | )
Deferred tax liability — current (net investment in sales-type leases) |  | $ | (2,179,262 | ) |  | $ | (1,624,665 | )

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration