Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Allowance for credit losses    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period $ 70 $ 169
Charged to (Reduction of) Cost and Expenses 440 (171)
Charged to Other Accounts 450 72
Deductions (464) 0
Balance at End of Period 496 70
Inventory reserves    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period 747 676
Charged to (Reduction of) Cost and Expenses 271 1,767
Charged to Other Accounts 0 0
Deductions (300) (1,696)
Balance at End of Period $ 718 $ 747