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Significant Accounting Policies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) item	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit	$ (431,903)		$ (426,968)
Revenue recognition
Number of projects currently in production that could provide future variable consideration | item	0
Lease accounting
Liabilities	$ 952		$ 2,058
Accounting Standards Update 2016-02 [Member] | Scenario, Plan [Member] | Minimum [Member]
Lease accounting
Liabilities	125
Accounting Standards Update 2016-02 [Member] | Scenario, Plan [Member] | Maximum [Member]
Lease accounting
Liabilities	225
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit		$ 0
Option Agreement Two [Member] | Guadalupe De Los Reyes, Mexico [Member]
Revenue recognition
Value of carrying value for option payment proceeds to be recognized as contract liability	$ 0

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