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Revenue and Deferred Revenue (Tables) | 3 Months Ended
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Mar. 31, 2022
Revenue Recognition and Deferred Revenue [Abstract] |
Deferred Revenue Activity | Deferred revenue activity for the period ended March 31, 2022 and December 31, 2021 are as follows (in thousands):
| March 31, |  | December 31,
| 2022 |  | 2021
Balance, beginning of period | $ | 376 |  |  | $ | 250 |
Additions | 167 |  |  | 376 |
Revenue recognized | (149) |  |  | (250) |
Balance, end of period | $ | 394 |  |  | $ | 376 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 + Details
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