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Stockholders' Equity - Activity of Stock Options (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Options Outstanding, Number of Shares    
Beginning Balance (in shares)   5,422,130us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Forfeited (in shares) (1,660,354)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod (693,644)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Exercised (in shares) (321,696)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (137,097)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Granted (in shares) 992,452us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 687,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Ending Balance (in shares) 4,289,631us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options Outstanding, Price per Share Range    
Beginning Balance, lower limit (in dollars per share) $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitBalance $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitBalance
Beginning Balance, upper limit (in dollars per share) $ 6.55luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 6.74luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit
Forfeited, lower limit (in dollars per share) $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansForfeituresInPeriodExercisePriceRangeLowerRangeLimit $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansForfeituresInPeriodExercisePriceRangeLowerRangeLimit
Forfeited, upper limit (in dollars per share) $ 6.55luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansForfeituresInPeriodExercisePriceRangeUpperRangeLimit $ 6.74luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansForfeituresInPeriodExercisePriceRangeUpperRangeLimit
Exercised, lower limit (in dollars per share) $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisedInPeriodExercisePriceRangeLowerRangeLimit $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisedInPeriodExercisePriceRangeLowerRangeLimit
Exercised, upper limit (in dollars per share) $ 1.27luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisedInPeriodExercisePriceRangeUpperRangeLimit $ 1.18luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisedInPeriodExercisePriceRangeUpperRangeLimit
Granted, lower limit (in dollars per share) $ 1.37luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantsInPeriodExercisePriceRangeLowerRangeLimit $ 1.20luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantsInPeriodExercisePriceRangeLowerRangeLimit
Granted, upper limit (in dollars per share) $ 1.53luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantsInPeriodExercisePriceRangeUpperRangeLimit $ 1.31luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantsInPeriodExercisePriceRangeUpperRangeLimit
Ending Balance, lower limit (in dollars per share) $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitBalance $ 0.35luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitBalance
Ending Balance, upper limit (in dollars per share) $ 6.55luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 6.55luna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit
Options Outstanding, Weighted Average Exercise Price    
Beginning balance (in dollars per share)   $ 2.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Forfeited (in dollars per share) $ 2.22us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice $ 2.08us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Exercised (in dollars per share) $ 0.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 0.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Granted (in dollars per share) $ 1.43us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 1.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Ending balance (in dollars per share) $ 1.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Options Outstanding, Aggregate Intrinsic Value beginning balance (in shares) $ 784,154us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 639,904us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options Outstanding, Aggregate Intrinsic Value ending balance (in shares) 512,901us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 784,154us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options Exercisable, beginning balance (in shares)   3,775,388us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Options Exercisable, ending balance (in shares) 3,111,199us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Options Exercisable, Weighted Average Exercise Price, beginning balance (in dollars per share)   $ 2.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Options Exercisable, Weighted Average Exercise Price, ending balance (in dollars per share) $ 2.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Options Exercisable, Aggregate Intrinsic Value, beginning balance 697,826us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 604,292us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Options Exercisable, Aggregate Intrinsic Value, ending balance $ 453,032us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 697,826us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1