Summary of Significant Accounting Policies Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Accrued payroll and related costs	$ 2,119	$ 1,463
Warranty reserve	120	143
Contingent consideration	318	0
Restructuring charges	0	701
Other accrued liabilities	328	537
Accrued Liabilities, Current	$ 2,885	$ 2,844