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Summary of Significant Accounting Policies -Summary of Cumulative Effect of Changes Made to the Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Accounts receivable $ 5,055   $ 4,005
Deferred tax asset / (liability) 592   126
Equity:      
Accumulated deficit (60,370)   $ (57,664)
Accounting Standards Update 2014-09      
Assets      
Accounts receivable   $ 4,332  
Deferred tax asset / (liability)   52  
Equity:      
Accumulated deficit   (57,411)  
Accounting Standards Update 2014-09 | Adjustments due to ASC 606      
Assets      
Accounts receivable (144) 327  
Deferred tax asset / (liability) 74 (74)  
Equity:      
Accumulated deficit $ (70) $ 253