Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| Accounts receivable | $ 1,020 | $ 4,850 |
| Less allowances for doubtful accounts | (356) | (3,179) |
| Accounts receivable, net | $ 664 | $ 1,671 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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