Nature of business and summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Restricted Cash [Abstract] | ||
| Restricted cash | $ 63 | $ 173 |
| Credit Card | ||
| Restricted Cash [Abstract] | ||
| Restricted cash | $ 100 | $ 200 |
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- References No definition available.
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- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Details
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