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Debt, net - Schedule of Debt (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Oct. 05, 2017
Debt Instrument [Line Items]      
Debt, net $ 110,515 $ 108,429  
3.75% convertible senior notes due 2020, net of discount      
Debt Instrument [Line Items]      
Debt, net $ 110,515 $ 108,139  
Debt instrument, maturity date Mar. 01, 2020    
Interest rate percentage 3.75% 3.75% 3.75%
Other indebtedness — 5.50% interest rate      
Debt Instrument [Line Items]      
Debt, net $ 0 $ 290  
Interest rate percentage   5.50%