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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018		Dec. 31, 2017	Sep. 30, 2017		Dec. 31, 2016
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 35,998		$ 14,472	$ 10,973
Restricted cash	50		5,333	5,727
Total cash and restricted cash	$ 36,048	[1]	$ 19,805	$ 16,700	[1]	$ 29,857
[1] (a) The following table provides a reconciliation of cash and restricted cash to amounts reported within the condensed consolidated balance sheets: Cash and cash equivalents $35,998 $10,973 Restricted cash 50 5,727 Total cash and restricted cash $36,048 $16,700

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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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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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