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Stock Option Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2016
Feb. 28, 2014
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Shares Available for Grant            
Beginning balance           1,704,183
Exercised     $ 23 $ 5 $ 1  
Ending balance     2,822,995     2,822,995
Number of Options            
Beginning balance           5,643,410
Ending balance     5,561,098     5,561,098
2014 Plan            
Stock Option Plans            
Vesting period   4 years        
Maximum exercise term   10 years        
Exercise price of common stock of its fair value (as a percent)   100.00%        
Maximum number of options that may be re-issued under the 2016 plan 1,136,229          
Shares Available for Grant            
Ending balance 0          
2016 Plan            
Stock Option Plans            
Vesting period 4 years          
Maximum exercise term 10 years          
Exercise price of common stock of its fair value (as a percent) 100.00%          
Shares Available for Grant            
Beginning balance           1,704,183
Additional shares authorized           1,118,000
Granted           (190,000)
Forfeited           190,812
Ending balance     2,822,995     2,822,995
Number of Options            
Beginning balance           5,643,410
Granted           190,000
Exercised           (81,500)
Forfeited           (190,812)
Ending balance     5,561,098     5,561,098
Weighted-Average Exercise Price            
Beginning balance (in dollars per share)           $ 8.05
Granted (in dollars per share)           2.68
Exercised (in dollars per share)           0.28
Forfeited (in dollars per share)           7.07
Ending balance (in dollars per share)     $ 8.01     $ 8.01