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Liquidity and Uncertainties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Liquidity and Uncertainties
Net loss	$ 8,512	$ 8,363	$ 21,336	$ 22,709
Accumulated deficit	$ 127,797		$ 127,797		$ 106,461

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Liquidity And Uncertainties Disclosure Abstract

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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