v3.19.2

Contract assets and contract liabilities (Tables)

6 Months Ended

Jun. 30, 2019

Contract assets and contract liabilities

Schedule of contract asset, net and contract liability, net balance from customers and performance obligations included in revenues

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​	​	​	​	​	​	​
​	​	Contract		​	Contract
​		Assets, Net			Liabilities, Net
Balance at December 31, 2018	​	$	468	​	$	217,733
Balance at June 30, 2019	​	​	756	​	​	237,109
Change	​	$	288	​	$	19,376

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​	​	​	​	​	​	​
​	​	​		​	​	​
​	​	Three Months Ended		​	Six Months Ended
​		June 30, 2019			June 30, 2019
Amounts included in the beginning of period contract liability balance	​	$	22,629	​	$	51,500
Amounts associated with performance obligations satisfied in previous periods	​		7	​	​	301

X

- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration