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Summary of Significant Accounting Policies - Liquidity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Accumulated deficit	$ 151,864		$ 139,724
Net cash used in operating activities	8,202	$ 13,494
Cash and cash equivalents	14,004	$ 18,500	$ 22,408	$ 27,900
Debt covenant minimum cash balance	$ 5,000
Minimum
Revenue Target [Line Items]
Quarterly increase in revenue target (percent)	2.00%
Maximum
Revenue Target [Line Items]
Quarterly increase in revenue target (percent)	4.00%

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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