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Trade Receivables & Trade Receivables - Related Parties - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Accounts Receivable Net Current [Abstract]
Allowance for doubtful accounts	$ 0
Receivables from related parties	$ 1,290,000	$ 2,950,000

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- References

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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