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Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Apr. 06, 2007
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders Equity Note Disclosure [Line Items]        
Common stock, shares reserved     4,005,174us-gaap_CommonStockCapitalSharesReservedForFutureIssuance  
Common stock, shares purchased through issuance of warrants 150,000rgen_StockIssuedDuringPeriodSharesCommonStockWarrants      
Common stock, shares purchased through issuance of warrants per share $ 0.01us-gaap_EquityIssuancePerShareAmount      
Warrant term 7 years      
Stock-based compensation expense   $ 1,766,532us-gaap_ShareBasedCompensation $ 1,059,806us-gaap_ShareBasedCompensation $ 1,024,152us-gaap_ShareBasedCompensation
Stock options, outstanding   1,225,117us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,610,988us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,315,090us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of shares available for future grant   2,780,057us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Closing price of common stock   $ 19.80us-gaap_SharePrice    
Aggregate intrinsic value of stock options exercised   10,474,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 3,723,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1,384,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Weighted average grant date fair value of share-based awards granted   $ 4.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 3.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Total fair value of stock options vested   1,084,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 991,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 931,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Total unrecognized compensation cost   $ 4,143,883us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation cost, weighted average remaining requisite service period   3 years 3 months 4 days    
Number of unvested options   723,010us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares    
Employee Stock Option | Minimum        
Stockholders Equity Note Disclosure [Line Items]        
Incentive options, vesting period       3 years
Incentive options, vesting on the first anniversary of the date of grant       20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Employee Stock Option | Maximum        
Stockholders Equity Note Disclosure [Line Items]        
Incentive options, vesting period       5 years
Incentive options, vesting on the first anniversary of the date of grant       33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Incentive options, term       10 years
Non-Employee Directors and Consultants        
Stockholders Equity Note Disclosure [Line Items]        
Incentive options, vesting period       1 year
Unvested Options        
Stockholders Equity Note Disclosure [Line Items]        
Incentive options, vesting period   5 years