Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	$ 540	$ 605	$ 1,000	$ 1,100
Bundled rental agreement, term			7 years
Dividend yield	0.00%	0.00%	0.00%
Research and development | Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	$ 404	$ 362	$ 784	683
Sales, general and administrative | Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation and amortization expense	$ 138	$ 245	$ 267	$ 468
Minimum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Property, Plant and Equipment, Useful Life			1 year
Maximum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Property, Plant and Equipment, Useful Life			7 years