Revenue - Deferred Revenue (Details) - USD ($) $ in Thousands  | 
Mar. 31, 2022  | 
Dec. 31, 2021  | 
|---|---|---|
| Product Information [Line Items] | ||
| Total current deferred revenue | $ 3,263 | $ 3,973 | 
| Non-current deferred revenue | 1,008 | 1,299 | 
| Total deferred revenue | 4,271 | 5,272 | 
| Hardware revenue | ||
| Product Information [Line Items] | ||
| Total current deferred revenue | 1,344 | 2,149 | 
| Platform revenue | ||
| Product Information [Line Items] | ||
| Total current deferred revenue | 1,919 | 1,824 | 
| Non-current deferred revenue | $ 1,008 | $ 1,299 | 
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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