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Lease Liabilities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lease Liabilities      
Option to Extend true    
Number of options to extend lease | item 2    
Expected lease term 5 years    
Classification on the Balance Sheet      
Operating lease assets $ 25,526 $ 27,082  
Finance lease assets, net 1,822 2,973  
Total lease assets 27,348 30,055  
Operating leases, current $ 2,740 $ 2,282  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating And Finance Lease Liability Current Operating And Finance Lease Liability Current  
Finance leases, current $ 1,042 $ 1,222  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating And Finance Lease Liability Current Operating And Finance Lease Liability Current  
Operating leases, non-current $ 28,032 $ 30,772  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] omer:OperatingAndFinanceLeaseLiabilityNonCurrent omer:OperatingAndFinanceLeaseLiabilityNonCurrent  
Finance leases, non-current $ 738 $ 1,546  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] omer:OperatingAndFinanceLeaseLiabilityNonCurrent omer:OperatingAndFinanceLeaseLiabilityNonCurrent  
Total lease liabilities $ 32,552 $ 35,822  
Operating leases 6 years 9 months 18 days 7 years 9 months 18 days  
Finance leases 1 year 10 months 24 days 2 years 6 months  
Operating leases 12.85% 12.85%  
Finance leases 11.85% 12.17%  
Lease cost      
Operating lease cost $ 6,055 $ 4,604  
Amortization 1,367 1,340  
Interest 295 337  
Variable lease cost 2,893 2,320  
Sublease income (1,300) (913)  
Total lease cost 9,310 7,688  
Operating cash flows used for operating leases 10,103 6,951  
Operating cash flows used for finance leases 295 337  
Financing cash flows used for finance leases $ 1,195 $ 1,139 $ 951