Deferred revenue |
| | Year ended December 31, 2021 | | | | Services Revenues | | | Products Revenue | | | Total Revenue | | Timing of revenue recognition: | | | | | | | | | | Products and services transferred over time | | $ | 6,659,000 | | | $ | — | | | $ | 6,659,000 | | Products and services transferred at a point in time | | | 12,844,000 | | | | — | | | | 12,844,000 | | Total | | $ | 19,503,000 | | | $ | — | | | $ | 19,503,000 | | | | | | | | | | | | | | | | | | Year ended December 31, 2020 | | | | Services Revenues | | | Products Revenue | | | Total Revenue | | Timing of revenue recognition: | | | | | | | | | | | | | Products and services transferred over time | | $ | 10,670,000 | | | $ | — | | | $ | 10,670,000 | | Products and services transferred at a point in time | | | 6,234,000 | | | | 578,000 | | | | 6,812,000 | | Total | | $ | 16,904,000 | | | $ | 578,000 | | | $ | 17,482,000 | |
Balance at December 31, 2020 | | $ | 180,000 | | Reclassification of beginning deferred revenue to revenue, as a result of performance obligations satisfied | | | (180,000 | ) | Cash received in advance and not recognized as revenue | | | 842,000 | | Balance at December 31, 2021 | | $ | 842,000 | |
|