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Revenue	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Revenue	3. Revenue Revenue recognized in the three and six months ended June 30, 2018 and 2019 was $nil. The aggregate transaction price that is allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of June 30, 2019 was $nil.

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- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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- References

No definition available.

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