Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Additional Information (Details)

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Description of Business - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Description Of Business [Abstract]        
Cash $ 42,327 $ 45,780 [1] $ 38,690 $ 43,471
[1] The condensed consolidated balance sheet as of December 31, 2018 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, 2018.