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Stockholders' Equity - Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 58us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Net current-period other comprehensive loss (34)us-gaap_OtherComprehensiveIncomeLossNetOfTax (3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance 24us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Marketable Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 58us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
Other comprehensive loss before reclassifications (34)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
Amounts reclassified from accumulated other comprehensive loss 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
Net current-period other comprehensive loss (34)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
Ending balance $ 24us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember