Organization and Nature of Business; Basis of Presentation; Principles of Consolidation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	$ 2.5	$ 2.2	$ 2.3
Reclassification | Research and development
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	0.8	1.1	1.4
Reclassification | Sales, general and administrative
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	$ 1.2	$ 0.6	$ 1.0