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		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Current Fiscal Year End Date	--12-31
Research and development	$ 4,288	$ 7,675
Sales, general and administrative	$ 10,526	$ 7,660
Bundled rental agreement, term			7 years
Dividend yield	0.00%	0.00%
Reclassification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development		$ 322
Sales, general and administrative		$ 223