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Consolidated Statements of Operations (Parentheticals) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity-based compensation expense included in cost of revenues $ 300dspg_CostOfRevenueIncludesEquityBasedCompensationExpense $ 253dspg_CostOfRevenueIncludesEquityBasedCompensationExpense $ 330dspg_CostOfRevenueIncludesEquityBasedCompensationExpense
Equity-based compensation expenses included in research and development, net 2,381dspg_ResearchAndDevelopmentIncludesEquityBasedCompensationExpense 1,873dspg_ResearchAndDevelopmentIncludesEquityBasedCompensationExpense 2,425dspg_ResearchAndDevelopmentIncludesEquityBasedCompensationExpense
Equity-based compensation expense included in sales and marketing 621dspg_SalesAndMarketingIncludesEquityBasedCompensationExpense 478dspg_SalesAndMarketingIncludesEquityBasedCompensationExpense 778dspg_SalesAndMarketingIncludesEquityBasedCompensationExpense
Equity-based compensation expense included in general and administrative $ 2,057dspg_GeneralAndAdministrativeIncludesEquityBasedCompensationExpense $ 1,555dspg_GeneralAndAdministrativeIncludesEquityBasedCompensationExpense $ 1,450dspg_GeneralAndAdministrativeIncludesEquityBasedCompensationExpense