Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Disaggregation of Revenue [Line Items] | ||||
| Revenue from contracts with customer | $ 100 | |||
| Operating lease, contract term | 12 months | 12 months | ||
| Revenue recognized included in contract liabilities | $ 300 | $ 300 | $ 500 | $ 700 |
| 3D Printers | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Revenue from contracts with customer | 6,313 | 9,300 | $ 16,965 | 14,589 |
| Shipping | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Revenue from contracts with customer | 100 | 100 | $ 100 | |
| Parts | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Revenue from contracts with customer | $ 200 | $ 100 | ||
| Equipment on lease | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Useful life | 5 years | 5 years | ||
| Minimum | 3D Printers | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Time acceptance test, period | 3 months | |||
| Maximum | 3D Printers | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Time acceptance test, period | 6 months | |||
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Revenue, Time Acceptance Test, Period No definition available.
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