Restructuring and Exit Costs (Details Textual) ft² in Thousands	3 Months Ended		9 Months Ended		15 Months Ended	18 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2015 ft²
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	$ 1,251,000	$ 0	$ 2,248,000	$ 297,000
Lease Obligation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	200,000
Amount of liability	700,000		700,000				$ 800,000
September 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs			1,200,000
September 2017 Restructuring Plan | Employee Severance Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs			1,195,000
Cash payments with restructuring plan			58,000
Amount of liability	1,137,000		1,137,000				0
February 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	100,000		900,000
February 2017 Restructuring Plan | Employee Severance Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs			997,000
Cash payments with restructuring plan			855,000
Amount of liability	$ 0		$ 0				$ 0
2015 Consolidation of US Manufacturing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs					$ 2,800,000
Accelerated equipment depreciation expense					600,000
Cash payments with restructuring plan						$ 1,500,000
2015 Consolidation of US Manufacturing Operations | Restructuring and exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs		0		300,000
2015 Consolidation of US Manufacturing Operations | Cost of revenue
Restructuring Cost and Reserve [Line Items]
Accelerated equipment depreciation expense				100,000
2015 Consolidation of US Manufacturing Operations | Lease Obligation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs					1,300,000
Square feet of manufacturing facility | ft²								60
2015 Consolidation of US Manufacturing Operations | Employee Severance Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs					1,200,000
Cash payments with restructuring plan		$ 0		$ 500,000
2015 Consolidation of US Manufacturing Operations | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs					$ 300,000