Significant Accounting Policies Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Customer Markets	Jun. 29, 2018 USD ($)	Jan. 03, 2018 $ / shares shares	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of primary end markets | Markets	2
Backlog	$ 23,200
Restricted cash	$ 4,000	$ 4,000		$ 0	$ 0	$ 0
Common stock purchase limit (in shares) | shares			6,006,667
Price per share (in usd per share) | $ / shares			$ 1.00
Hardware Solutions [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of customers | Customer	1
Machinery, equipment, furniture and fixtures
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software, computer hardware and manufacturing test fixtures
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Engineering demonstration products and samples
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warranty, Term	12 months
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warranty, Term	24 months