Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Future minimum lease payments in subsequent fiscal years under noncancelable operating leases [Abstract]
2018	$ 817,000
2019	430,000
2020	279,000
2021	254,000
2022	164,000
Thereafter	544,000
Total future minimum lease payments	2,488,000
Total operating lease expenses	734,000	$ 695,000
Future minimum purchase agreement payments in subsequent years [Abstract]
2018	0
2019	300,000
2020	600,000
2021	900,000
2022	1,200,000
Thereafter	1,500,000
Total future minimum purchase agreement payments	4,500,000
Product Liability [Abstract]
Product liability insurance coverage	$ 10,000,000