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Nature of Business and Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported within Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Changes And Error Corrections [Abstract]
Cash and cash equivalents	$ 43,676	$ 29,902
Restricted cash	762	591
Restricted cash included within deferred charges and other assets		166
Total cash, cash equivalents and restricted cash	$ 44,438	$ 30,659	$ 48,006	$ 39,513

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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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