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Offerings of Common Stock (Schedule of Common Stock Classified Outside of Stockholders' Equity) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Amount    
Ending balance $ 0us-gaap_TemporaryEquityCarryingAmountAttributableToParent $ 5,500,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Common Stock [Member]    
Number of Shares    
Beginning balance 5,000,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,561,847us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of common stock classified outside of stockholders’ equity (deficit) 0us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Reclassification to stockholders’ equity (deficit) (5,000,000)us-gaap_StockholdersEquityOtherShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(4,561,847)us-gaap_StockholdersEquityOtherShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Ending Balance 0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
5,000,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Amount    
Beginning balance 5,500,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
11,775,724us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of common stock classified outside of stockholders’ equity (deficit) 0us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Reclassification to stockholders’ equity (deficit) (5,500,000)rgdx_ReclassificationOfEquityInstruments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(6,275,724)rgdx_ReclassificationOfEquityInstruments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Ending balance $ 0us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 5,500,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember