The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Restricted Cash - Additional Information (Detail) (USD $)					12 Months Ended
	Dec. 31, 2013	May 10, 2012	Jul. 11, 2008	Dec. 31, 2013 Term Loan [Member]	Dec. 31, 2013 Project Term Loan [Member]	Jul. 31, 2013 Project Term Loan [Member]	Dec. 31, 2013 Project Term Loan [Member] Gairsoppa [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 500,000		$ 500,000	$ 405,626	$ 280,106	$ 500,000
Restricted cash	400,000
Restricted cash and cash equivalents maturity period					2013-07
Restricted cash for term loan		8,000,000				10,000,000
Loan maturity period					2014-07
Restricted cash							$ 10,000,000