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Revenue	6 Months Ended
	Jun. 30, 2018
Revenue Recognition [Abstract]
Revenue	3. Revenue Revenue recognized in the three and six months ended June 30, 2017 and 2018 was $0 and contract liability as of December 31, 2017 and June 30, 2018 was $150,000 and is included in Accrued and other current liabilities on the accompanying balance sheets. The aggregate transaction price that is allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of June 30, 2018 was $0.

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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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