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Joint Venture - Changes in Total Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 95 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]      
Balance, June 30, 2018 $ 426,162    
Exercise of common stock options and release of RSUs 105    
Withholding tax on restricted stock units (109)    
Repurchase of common shares under shares repurchase program (1,501)   $ (67,300)
Stock-based compensation expense 3,129    
Net income (loss) (913) $ 3,339  
Net loss attributable to noncontrolling interest (3,329) $ (1,461)  
Cumulative translation adjustment (6,237)    
Balance, September 30, 2018 421,672   421,672
Accounting Standards Update 2016-16      
Schedule of Equity Method Investments [Line Items]      
Impact on retained earnings related to ASC 606 adoption 1,036    
Parent      
Schedule of Equity Method Investments [Line Items]      
Balance, June 30, 2018 278,594    
Exercise of common stock options and release of RSUs 105    
Withholding tax on restricted stock units (109)    
Repurchase of common shares under shares repurchase program (1,501)    
Stock-based compensation expense 3,129    
Net income (loss) 2,416    
Cumulative translation adjustment (3,248)    
Balance, September 30, 2018 280,422   280,422
Parent | Accounting Standards Update 2016-16      
Schedule of Equity Method Investments [Line Items]      
Impact on retained earnings related to ASC 606 adoption 1,036    
Noncontrolling Interest      
Schedule of Equity Method Investments [Line Items]      
Balance, June 30, 2018 147,568    
Exercise of common stock options and release of RSUs 0    
Withholding tax on restricted stock units 0    
Repurchase of common shares under shares repurchase program 0    
Stock-based compensation expense 0    
Net loss attributable to noncontrolling interest (3,329)    
Cumulative translation adjustment (2,989)    
Balance, September 30, 2018 141,250   $ 141,250
Noncontrolling Interest | Accounting Standards Update 2016-16      
Schedule of Equity Method Investments [Line Items]      
Impact on retained earnings related to ASC 606 adoption $ 0