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Stock Option Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2016
Feb. 28, 2014
Mar. 31, 2020
Mar. 31, 2019
Shares Available for Grant        
Beginning balance     1,704,183  
Exercised       $ 1
Ending balance     2,745,773  
Number of Options        
Beginning balance     5,643,410  
Ending balance     5,719,820  
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     (100,000)  
Forfeited     23,590  
Ending balance     2,745,773  
Number of Options        
Beginning balance     5,643,410  
Granted     100,000  
Forfeited     (23,590)  
Ending balance     5,719,820  
Weighted-Average Exercise Price        
Beginning balance (in dollars per share)     $ 8.05  
Granted (in dollars per share)     2.14  
Forfeited (in dollars per share)     7.24  
Ending balance (in dollars per share)     $ 7.95