Quarterly report pursuant to Section 13 or 15(d)

Company Description and Summary of Significant Accounting Policies, Fair Value of Financial Instruments Measured on a Recurring Basis (Details)

v3.22.1
Company Description and Summary of Significant Accounting Policies, Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Company Description and Summary of Significant Accounting Policies [Abstract]      
Transfers from Level 1 to Level 2 $ 0 $ 0  
Transfers from Level 2 to Level 1 0 0  
Transfers in into Level 3 0 0  
Transfers out of Level 3 0 $ 0  
Recurring Basis [Member]      
Assets [Abstract]      
Assets at fair value 135   $ 219
Recurring Basis [Member] | Short- term investments [Member]      
Assets [Abstract]      
Assets at fair value 135   219
Recurring Basis [Member] | Level 1 [Member]      
Assets [Abstract]      
Assets at fair value 135   219
Recurring Basis [Member] | Level 1 [Member] | Short- term investments [Member]      
Assets [Abstract]      
Assets at fair value 135   219
Recurring Basis [Member] | Level 2 [Member]      
Assets [Abstract]      
Assets at fair value 0   0
Recurring Basis [Member] | Level 2 [Member] | Short- term investments [Member]      
Assets [Abstract]      
Assets at fair value 0   0
Recurring Basis [Member] | Level 3 [Member]      
Assets [Abstract]      
Assets at fair value 0   0
Recurring Basis [Member] | Level 3 [Member] | Short- term investments [Member]      
Assets [Abstract]      
Assets at fair value $ 0   $ 0