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Commitments and Contingencies (Details) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Apr. 15, 2013
sqft
Leases            
Deferred rent $ 1,370,000   $ 148,000 $ 176,000    
Rent expense under operating leases 1,282,000 585,000 1,488,000 798,000 346,000  
Future minimum operating lease payments            
2013     2,367,000      
2014     2,765,000      
2015     3,014,000      
2016     2,072,000      
Total     10,218,000      
Area of office space (in square feet)           10,406
Portland lease 1,200,000   0      
Term of operating lease 5 years          
Future payments for non-cancellable contractual agreements            
2013     2,700,000      
2014     616,000      
2015     $ 113,000