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Revenue Recognition
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Disaggregated Revenues
The table below presents revenue disaggregated by source, for the three months ended March 31, 2021 and 2020 (in thousands):
Three Months Ended March 31,
20212020
LNG Product$11,695 $9,131 
Rental3,387 2,890 
Service242 93 
Power Delivery1,544 1,310 
Other796 414 
$17,664 $13,838 
The table below presents revenue disaggregated by geographic location, for the three months ended March 31, 2021 and 2020 (in thousands):
Three Months Ended March 31,
20212020
Revenues
Brazil$1,544 $1,310 
Mexico1,616 33 
United States14,504 12,495 
$17,664 $13,838 
See Note 4—Business Segments, below, for additional disaggregation of revenue.
Contract Liabilities
The Company recognizes contract liabilities upon receipt of payments for which the performance obligations have not been fulfilled at the reporting date, resulting in deferred revenue. Contract liabilities are included in accrued liabilities in the accompanying unaudited condensed consolidated balance sheets. The following table presents the changes in the Company’s contract liabilities for the periods ended March 31, 2021 and December 31, 2020 (in thousands):
March 31, 2021December 31, 2020
Balance at beginning of period$357 $185 
Cash received, excluding amounts recognized as revenue31 777 
Amounts recognized as revenue(344)(605)
Balance at end of period$44 $357 
The Company has no other material contract assets or liabilities and contract costs.