Annual report pursuant to Section 13 and 15(d)

Other Long-Term Assets - Narrative (Details)

v2.4.1.9
Other Long-Term Assets - Narrative (Details) (USD $)
 11 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jan. 31, 2013
Jun. 30, 2013
Schedule of Other Assets [Line Items]          
Patents, net of amortization $ 7,636,000us-gaap_IntangibleAssetsNetExcludingGoodwill   $ 6,939,000us-gaap_IntangibleAssetsNetExcludingGoodwill    
Patents, accumulated amortization 400,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   1,100,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Patents, amortization expense 400,000us-gaap_AmortizationOfIntangibleAssets   700,000us-gaap_AmortizationOfIntangibleAssets    
Purchase price of assets of KXMZ-FM paid in cash 400,000us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross  
KXMZ-FM          
Schedule of Other Assets [Line Items]          
Purchase price of assets of KXMZ-FM         600,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= p_KXMZFMMember
Purchase price of assets of KXMZ-FM paid in cash     400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= p_KXMZFMMember 		   
Yahoo! Inc. | Patents          
Schedule of Other Assets [Line Items]          
Finite-lived intangible assets acquired         $ 8,000,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_CounterpartyNameAxis
= p_YahooInc.Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Finite-lived intangible asset, useful life         11 years