Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]
Term of warranty - Min	1 year
Term of Warranty - max	2 years
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 960	$ 1,140
Software Development Costs, net [Abstract]
Software Development Costs Useful Life	3 years
Development Expenditures [Abstract]
Development Expenditures	$ 1,600	1,600
Capitalized software development costs	177	245
Impairment of Long-Lived Assets to be Disposed of	222	0
Product Warranty [Roll Forward]
Beginning balance	1,478	1,614
Current year provision	707	355
Current year claims	(245)	(467)
Currency adjustment	13	(24)
Ending balance	1,953	1,478
Numerator: [Abstract]
Net income (loss)	$ 5,384	$ 1,422
Denominator: [Abstract]
Weighted-average shares outstanding for basic income (loss) per share (in shares)	19,259,966	18,218,681
Effect of dilutive securities [Abstract]
Stock options and restricted stock units (in shares)	345,461	293,585
Adjusted weighted-average shares outstanding and assumed conversions for diluted income (loss) per share (in shares)	19,605,427	18,512,266
Shares related to dilutive securities excluded because inclusion would be anti-dilutive (in shares)	374,833	677,964
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 1,100
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		1,173
Interest-bearing Deposits [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 1,000	1,100
Interest Income, Other Domestic Deposits	2	$ 6
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 900
Equipment, Software and Leasehold Improvements, net [Member] | Maximum [Member]
Equipment, software and leasehold improvements, net [Abstract]
Estimated useful life	10 years
Equipment, Software and Leasehold Improvements, net [Member] | Minimum [Member]
Equipment, software and leasehold improvements, net [Abstract]
Estimated useful life	3 years