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Other Non-Current Assets - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Other Long Term Assets [Line Items]
Deposits for conservation and documentation of artifacts	$ 100,000
Deposits	532,500	$ 532,500
UNITED KINGDOM
Other Long Term Assets [Line Items]
Deposits with United Kingdom's Ministry of Defense	$ 432,500

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- Definition

Deposits to fund conservation and documentation.

+ References

No definition available.

+ Details

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- Definition

Deposits with ministry of defense.

+ References

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- Definition

Other long term assets.

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- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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