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Subsequent Event (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2015
Jun. 30, 2015
Kingstone Hong Kong    
Subsequent Event [Line Items]    
Equity method investment, ownership percentage   55.00%
Restructuring Of Investment, Investment Agreement | Subsequent Event    
Subsequent Event [Line Items]    
Amount to be received for a portion of its equity ownership $ 4.0  
Purchase from the Company of exclusive right to sell and service products $ 5.6  
Restructuring Of Investment, Investment Agreement | Kingstone Hong Kong | Subsequent Event    
Subsequent Event [Line Items]    
Equity method investment, ownership percentage 15.00%  
Restructuring Of Investment, Investment Agreement | Kingstone Semiconductor Company Ltd | Subsequent Event    
Subsequent Event [Line Items]    
Equity method investment, ownership percentage 31.25%  
Kingstone Hong Kong | Restructuring Of Investment, Investment Agreement | Kingstone Semiconductor Company Ltd | Subsequent Event    
Subsequent Event [Line Items]    
Equity method investment, ownership percentage 68.75%  
Suzhou Zhuo Jing Investment Center | Restructuring Of Investment, Investment Agreement | Kingstone Semiconductor Company Ltd | Subsequent Event    
Subsequent Event [Line Items]    
Equity method investment, ownership percentage 31.25%  
Solar Tool Loan Agreement | Restructuring Of Investment, Investment Agreement | Subsequent Event    
Subsequent Event [Line Items]    
Repayment of outstanding principal $ 4.0