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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Unapplied purchase commitment due $ 4,100,000oxgn_PurchaseCommitmentAmountDue
Unapplied purchase commitment estimated and accrued 73,000oxgn_PurchaseCommitmentEstimatedAndAccrued
Purchase commitment due 4,027,000us-gaap_LongTermPurchaseCommitmentAmount
Unapplied purchase commitment due over the next nine months $ 2,303,000oxgn_FuturePurchaseCommitment