Quarterly report pursuant to Section 13 or 15(d)

Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)

v3.8.0.1
Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Customers
Mar. 31, 2017
Dec. 31, 2017
USD ($)
Organization [Line Items]      
Cumulative impact to retained earnings $ (122,479)   $ (109,307)
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Organization [Line Items]      
Number of major customers | Customers 10    
Concentration risk percentage 58.70% 76.60%  
Accounting Standards Update 2016-09 [Member]      
Organization [Line Items]      
Cumulative impact to retained earnings $ 123