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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] |
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 30, |  |  |  | June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Revenue recognized over time | $ | 1,439 |  |  | $ | 1,496 |  |  | $ | 2,914 |  |  | $ | 2,861 |
Revenue recognized at a point in time | 1,250 |  |  | 1,539 |  |  | 2,532 |  |  | 2,929 |
Total revenue | $ | 2,689 |  |  | $ | 3,035 |  |  | $ | 5,446 |  |  | $ | 5,790 |
Net Contract Assets and Liabilities | Net contract assets were as follows:
| June 30, 2020 |  | December 31, 2019
Contract assets included in prepaid and other current assets | $ | 52 |  |  | $ | 30 |
Contract liabilities included in accrued liabilities | (3) |  |  | (5) |
Net contract asset | $ | 49 |  |  | $ | 25 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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