The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

No definition available.

Name:	us-gaap_FutureAmortizationExpenseYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

No definition available.

Name:	us-gaap_FutureAmortizationExpenseYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

No definition available.

Name:	us-gaap_FutureAmortizationExpenseYearOne
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

No definition available.

Name:	us-gaap_FutureAmortizationExpenseYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

No definition available.

Name:	us-gaap_FutureAmortizationExpenseYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

8. INTANGIBLE ASSETS (Detail) - Estimate of Aggregate Amortization Expense (USD $)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
2013					$ 49,330
2014				48,557
2015			47,982
2016		45,207
2017	$ 40,640