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Common Stock Incentive Plan - Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Common Stock Incentive Plan          
Severance charge   $ 3,500      
2012 Plan          
Common Stock Incentive Plan          
Plan term from the date of adoption       10 years  
General and administrative expense          
Common Stock Incentive Plan          
Share-based compensation costs recognized $ 4,900   $ 4,500 $ 10,400 $ 7,300
Accelerated share-based compensation costs       $ 1,800  
Maximum | 2012 Plan          
Common Stock Incentive Plan          
Authorized shares 3,985,734     3,985,734  
Cash          
Common Stock Incentive Plan          
Severance charge   1,600      
Share-based compensation          
Common Stock Incentive Plan          
Severance charge   1,800      
Professional fees          
Common Stock Incentive Plan          
Severance charge   $ 58