Summary of Significant Accounting Policies - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Accrued payroll and related costs	$ 1,299	$ 2,119
Product Warranty Accrual	245	120
Warranty reserve		120
Contingent consideration	0	318
Restructuring charges	273	0
Other accrued liabilities	484	328
Accrued Liabilities, Current	$ 2,174	$ 2,885