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Other Non-Current Assets - Additional Information (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Other Long Term Assets [Line Items]
Deposits for conservation and documentation of artifacts		$ 100,000
Deposits		532,500
UNITED KINGDOM
Other Long Term Assets [Line Items]
Deposits with United Kingdom's Ministry of Defense		$ 432,500
Return of deposits with United Kingdom's Ministry of Defense	$ 588,965

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- Definition

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+ References

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- Definition

Deposits with ministry of defense.

+ References

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- Definition

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- Definition

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+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-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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