The Company, Revenue Recognition (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Arrangement	Dec. 31, 2017 USD ($)
Revenue Recognition [Abstract]
Number of types of arrangements | Arrangement	2
Remaining performance obligations	$ 429
Short-term contract liabilities	162
Long-term contract liabilities	267
Contract liabilities recognized as revenue	58
Revenue reimbursements	579	$ 902
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue Recognition [Abstract]
Remaining performance obligations	$ 162
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue Recognition [Abstract]
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue Recognition [Abstract]
Expected timing of satisfaction period	1 year