Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Financial Statements Detail - Additional Information 1 (Details)

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Condensed Consolidated Financial Statements Detail - Additional Information 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 38,690 $ 43,471 [1]
Money market funds   8,600
Demand Deposits [Member]    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 38,700 $ 34,900
[1] The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.