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Revenue (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue  
Schedule of amounts recorded in accrued liabilities

 

 

 

 

 

 

 

 

 

March 31, 

 

December 31, 

 

 

2018

 

2017

Contract liabilities

 

$

(1,061)

 

$

(924)

Revenue recognized in the three months period ended from:

 

 

 

 

 

 

Amounts included in contract liabilities at the beginning of the period

 

$
643

 

$
563