Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details 3)

v2.4.1.9
STOCK-BASED COMPENSATION (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Number of Options outstanding    
Outstanding, at the beginning of the year (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted (in shares) 491,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Outstanding at the end of the reporting period (in shares) 491,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Options Exercisable    
Exercisable at the beginning of the year 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Vested (in shares) 142,895us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares  
Exercisable at the end of the reporting period (in shares) 142,895us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted Average Exercise Price    
Granted, options outstanding (in dollars per share) $ 6.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Outstanding at the end of the reporting period (in dollars per share) $ 6.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Vested, options exercisable (in dollars per share) $ 6.02resn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedOptionsExercisableWeightedAverageExercisePrice  
Exercisable at the end of the reporting period (in dollars per share) $ 6.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Weighted Average Grant Date Fair Value    
Options granted (in dollars per share) $ 4.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Outstanding at the end of the reporting period (in dollars per share) $ 4.14resn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue  
Vested, options exercisable (in dollars per share) $ 4.01resn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedOptionsExercisableWeightedAverageGrantDateFairValue  
Exercisable at the end of the reporting period (in dollars per share) $ 4.01resn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue  
Weighted Average Remaining Life In Years    
Granted 9 years 5 months 1 day  
Vested 9 years 4 months 28 days  
Outstanding at the end of the reporting period 9 years 5 months 1 day  
Exercisable at the end of the reporting period 9 years 4 months 28 days  
Total Grant Date Fair Value    
Granted $ 2,033,709resn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodGrantDateIntrinsicValue  
Outstanding at the end of the reporting period 2,033,709us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Vested 573,691resn_SharebasedCompensationArrangementBySharebasedPaymentAwardVestedOptionsExercisableIntrinsicValue1  
Exercisable at the end of the reporting period 573,691us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 491,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Vested (in shares) 142,895us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares  
Weighted-Average Grant-Date Fair Value    
Granted (in dollars per share) $ 4.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
$5.79 - $6.00    
Number of Options outstanding    
Outstanding at the end of the reporting period (in shares) 369,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeOneMember
 
Number of Options Exercisable    
Exercisable at the end of the reporting period (in shares) 139,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeOneMember
 
Weighted Average Remaining Life In Years    
Exercisable at the end of the reporting period 9 years 4 months 28 days  
$5.79 - $6.00 | Minimum    
Weighted Average Exercise Price    
Exercise price $ 5.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeOneMember
 
$5.79 - $6.00 | Maximum    
Weighted Average Exercise Price    
Exercise price $ 6.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeOneMember
 
$6.49 - $6.97    
Number of Options outstanding    
Outstanding at the end of the reporting period (in shares) 47,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeTwoMember
 
Number of Options Exercisable    
Exercisable at the end of the reporting period (in shares) 2,813us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeTwoMember
 
Weighted Average Remaining Life In Years    
Exercisable at the end of the reporting period 9 years 8 months 9 days  
$6.49 - $6.97 | Minimum    
Weighted Average Exercise Price    
Exercise price $ 6.49us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeTwoMember
 
$6.49 - $6.97 | Maximum    
Weighted Average Exercise Price    
Exercise price $ 6.97us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeTwoMember
 
$7.20 - $8.06    
Number of Options outstanding    
Outstanding at the end of the reporting period (in shares) 74,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeThreeMember
 
Number of Options Exercisable    
Exercisable at the end of the reporting period (in shares) 832us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeThreeMember
 
Weighted Average Remaining Life In Years    
Exercisable at the end of the reporting period 8 years 4 months 24 days  
$7.20 - $8.06 | Minimum    
Weighted Average Exercise Price    
Exercise price $ 7.20us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeThreeMember
 
$7.20 - $8.06 | Maximum    
Weighted Average Exercise Price    
Exercise price $ 8.06us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ resn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceAxis
= resn_ExercisePriceRangeThreeMember
 
Common stock options    
Stock Option Award Activity    
Unrecognized compensation expense related to unvested employee stock option $ 1,233,327us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average period 3 years 2 months 12 days  
Number of Options outstanding    
Granted (in shares) 491,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 491,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember