RESTATEMENT- Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Gross profit	$ 3,563	$ 2,212
Operating expenses	9,293	4,932
Other losses	295	0
Net loss	5,608	935
Operating income (loss)	(5,730)	(2,720)
Sales	(5,629)	$ (3,397)
Elimination Of Markup On Intercompany Sales | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Gross profit	113
Operating expenses	113
Income Tax Provision Corrections | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expenses	16
Other losses	301
Net loss	317
Appropriate Cutoff Of Transactions Corrections | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	40
Operating income (loss)	90
Stock-based Compensation Corrections | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expenses	453
Net loss	453
Operating income (loss)	(453)
Pre-development Activities On OEM Contracts | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expenses	(77)
Net loss	117
Operating income (loss)	(117)
Sales	$ 194