Other Accrued Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Other Accrued Liabilities [Abstract]
Accrued warranty, current	$ 119	$ 170	$ 194
Accrued compensation, including commissions and vacation	1,000	1,193
Accrued state sales, use and other taxes	3,097	3,193
Accrued professional fees and other accrued liabilities	487	578
Total other accrued liabilities	4,703	$ 5,134
Income Tax Examination, Penalties and Interest Accrued [Abstract]
Estimated tax positions subject to audit	801
Assessment amount	720
Interest amount	$ 171