Basis of Presentation - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Basis Of Presentation [Line Items]
Deferred tax asset	$ 4,800,000		$ 5,200,000
Deferred tax asset, valuation allowance	4,700,000		5,100,000
Lease assets	408,000
Lease liabilities	$ 408,000		$ 170,000
ASU 2014-09 [Member]
Basis Of Presentation [Line Items]
Revenue, performance obligation, description of timing	The Company meets these conditions upon the Company’s satisfaction of the performance obligation, usually at the time of shipment to the customer, because control passes to the customer at that time. Our standard terms for customers are net due within 30 days, with a few exceptions, none regularly exceeding 60 days.
ASU 2016-02 [Member]
Basis Of Presentation [Line Items]
Lease assets		$ 142,000
Lease liabilities		$ 142,000
Minimum [Member] | ASU 2014-09 [Member]
Basis Of Presentation [Line Items]
Customer due days	30 days
Maximum [Member] | ASU 2014-09 [Member]
Basis Of Presentation [Line Items]
Customer due days	60 days