Lease Agreements - Additional information (Details) - USD ($) $ in Thousands  | 
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2021  | 
Jun. 30, 2020  | 
Dec. 31, 2020  | 
|
| Lease Agreements | |||
| Cash paid for amounts included in the measurement of lease liabilities, Operating cash flows under operating leases | $ 98 | $ 94 | |
| Weighted-average remaining lease term, Operating leases | 1 year 8 months 1 day | 2 years 2 months 1 day | |
| Weighted-average discount rate, Operating leases | 5.51% | 5.51% | |
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Weighted average remaining lease term for 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/2003/role/exampleRef 
  |