Summary of Operations and Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Initial Cost	$ 5,589	$ 5,244
Net of Accumulated Amortization	$ 4,169	4,830
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization (in years)	5 years
Initial Cost	$ 2,200	2,100
Net of Accumulated Amortization	$ 1,731	2,071
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization (in years)	16 years
Initial Cost	$ 1,489	1,244
Net of Accumulated Amortization	$ 1,039	891
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization (in years)	5 years
Initial Cost	$ 1,600	1,600
Net of Accumulated Amortization	$ 1,259	1,578
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization (in years)	2 years
Initial Cost	$ 300	300
Net of Accumulated Amortization	$ 140	$ 290