Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation And Qualification Accounts (Details)

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Schedule II - Valuation And Qualification Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance at Beginning of Period $ 371 $ 865 $ 624
Charges to Expense 4,566 310 241
Deductions (149) 0 0
Balance at End of Period 4,788 371 865
Doubtful Accounts      
Balance at Beginning of Period 7 29  
Charges to Expense (7) 7 29
Deductions 0 0 0
Balance at End of Period 0 7 29
Inventory      
Balance at Beginning of Period 364 836 624
Charges to Expense 4,573 303 212
Deductions (149) 0 0
Balance at End of Period $ 4,788 $ 364 $ 836