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Short-term Investments - Additional Information (Detail)
In Thousands, unless otherwise specified
 0 Months Ended 0 Months Ended
Jan. 27, 2015
Nov. 24, 2014
Nov. 13, 2014
Mar. 31, 2015
USD ($)
Jan. 27, 2015
USD ($)
Jan. 27, 2015
CNY
Dec. 31, 2014
USD ($)
Dec. 03, 2014
USD ($)
Dec. 03, 2014
CNY
Nov. 24, 2014
USD ($)
Nov. 24, 2014
CNY
Nov. 13, 2014
USD ($)
Nov. 13, 2014
CNY
Jan. 27, 2015
61 Days maturity [Member]
Jan. 27, 2015
61 Days maturity [Member]
USD ($)
Jan. 27, 2015
61 Days maturity [Member]
CNY
Investments, All Other Investments [Abstract]                                
Short-term investments       $ 27,424us-gaap_ShortTermInvestments $ 4,839us-gaap_ShortTermInvestments 30,000us-gaap_ShortTermInvestments $ 27,354us-gaap_ShortTermInvestments     $ 19,358us-gaap_ShortTermInvestments 120,000us-gaap_ShortTermInvestments $ 8,066us-gaap_ShortTermInvestments 50,000us-gaap_ShortTermInvestments   $ 20,971us-gaap_ShortTermInvestments
/ invest_InvestmentAxis
= sopw_SixtyOneDaysMaturityMember		 130,000us-gaap_ShortTermInvestments
/ invest_InvestmentAxis
= sopw_SixtyOneDaysMaturityMember
Short-term Investment, Estimated Rate of Return 4.00%sopw_ShortTermInvestmentEstimatedRateOfReturn 4.50%sopw_ShortTermInvestmentEstimatedRateOfReturn 5.00%sopw_ShortTermInvestmentEstimatedRateOfReturn                     4.00%sopw_ShortTermInvestmentEstimatedRateOfReturn
/ invest_InvestmentAxis
= sopw_SixtyOneDaysMaturityMember		    
Short-term Debt       $ 61,637us-gaap_ShortTermBorrowings     $ 48,286us-gaap_ShortTermBorrowings $ 5,646us-gaap_ShortTermBorrowings 35,000us-gaap_ShortTermBorrowings              
Short term investment maturity period 61 days