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, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 12,465 $ 25,742 [1] $ 33,854 $ 65,767
Demand Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 2,600 21,500    
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 9,900 $ 4,200    
[1] The condensed consolidated balance sheet as of December 31, 2016 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, 2016.