Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v2.4.1.9
Commitments and Contingencies (Details) (Corporate headquarters and research and development laboratory, USD $)
0 Months Ended
Dec. 31, 2014
Dec. 31, 2014
sqft
Operating Lease    
Number of rentable square feet 33,928us-gaap_AreaOfRealEstateProperty 33,928us-gaap_AreaOfRealEstateProperty
Term of Lease Agreement 120 months  
Period by which the lease term can be extended 5 years  
Monthly base rent under Lease Agreement (per rentable square feet) 2.65oncs_BaseRentPerRentableSquareFeetUnderLeaseAgreement  
Annual base rent increase (as a percent) 3.00%oncs_AnnualBaseRentIncreaseInPercentage  
Period for Rent Commencement Date 12 months  
Initial deposit $ 90,000us-gaap_SecurityDeposit $ 90,000us-gaap_SecurityDeposit
Maximum
   
Operating Lease    
Notice period prior to expiration of the term for extending the Lease Agreement 12 months  
Minimum
   
Operating Lease    
Notice period for terminating the lease agreement 12 months