|3 Months Ended|
Mar. 31, 2021
|Revenue from Contract with Customer [Abstract]|
|Schedule of changes in contract liability balance||
The following table shows the significant changes in the contract liability balance for the quarters ended March 31, 2021 and 2020:
Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef