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Revenue, Contract Balances (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Revenue [Abstract] |  |  |
Revenue recognized | $ 600 |  |
Contract liabilities [Abstract] |  |  |
Unbilled receivables, current |  | $ 306 | $ 290
Unbilled receivables, non-current |  | 376 | 591
Customer pre-payments |  | (49) | (216)
Deferred revenue, current |  | (768) | (504)
Deferred revenue, non-current |  | (207) | (111)
Total net contract (liabilities) assets |  | $ (342) | $ 50

X
- Definition Amount, after allowance for credit loss, of right (asset) to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time and the amount of obligation (liability) to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References No definition available. + Details
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X
- Definition Amount of obligation to transfer good or service to customer related to customer prepayments for which consideration has been received or is receivable, classified as current. + References No definition available. + Details
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X
- Definition Amount of revenue recognized related to obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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