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Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Nov. 11, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Other Accrued Liabilities [Abstract]        
Accrued warranty, current   $ 107 $ 170 $ 179
Accrued compensation, including commissions and vacation   780 1,193  
Accrued state sales, use and other taxes   3,094 3,193  
Accrued professional fees and other accrued liabilities   577 578  
Total other accrued liabilities   4,558 $ 5,134  
Income Tax Examination, Penalties and Interest Accrued [Abstract]        
Estimated tax positions subject to audit   801    
Assessment amount   720    
Interest amount   $ 171    
Subsequent Event [Member] | Tax Period from September 2017 through February 2020 [Member]        
Income Tax Examination, Penalties and Interest Accrued [Abstract]        
Additional assessment including tax, interest and penalties $ 683