Business Description and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) Y	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts	$ 406,000		$ 337,000
Warranty period	27 months
Warranty reserve	$ 420,000		420,000
Inventory reserve	1,512,000		1,437,000
Income taxes paid	0	$ 0
Interest paid	42,000	$ 27,000
Impairment of long-lived assets	$ 0		$ 0
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of years of customer requirements | Y	2
Number of year's supply | Y	1