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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 87 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Oct. 31, 2019
Stock options          
Stock Option and Compensation Plans          
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures $ 7,200 $ 7,200   $ 7,200  
Expected weighted average period to recognize share-based compensation costs   2 years 8 months 12 days      
Restricted stock units          
Stock Option and Compensation Plans          
Expected weighted average period to recognize share-based compensation costs   2 years 9 months 18 days      
Unrecognized compensation costs, net of estimated forfeitures $ 4,100 $ 4,100   $ 4,100  
ESPP          
Stock Option and Compensation Plans          
Common stock issued (in shares)   43,581 31,522    
Proceeds from stock plans   $ 42 $ 42    
2013 Plan          
Stock Option and Compensation Plans          
Increase in number of shares available under the Plan (in shares)   1,985,000   10,539,000  
Annual increase in shares reserved for issuance under the Plan (as a percent)   4.00%      
Number of shares of common stock available for issuance under the Plan (in shares) 2,908,000 2,908,000   2,908,000  
2013 Plan | ESPP          
Stock Option and Compensation Plans          
Number of shares available for future purchase (in shares) 838,182 838,182   838,182  
2019 Inducement Plan | Stock options          
Stock Option and Compensation Plans          
Increase in number of shares available under the Plan (in shares) 1,000,000        
Number of shares of common stock available for issuance under the Plan (in shares) 1,622,000 1,622,000   1,622,000  
Number of initial shares reserved for issuance under the Plan (in shares)         1,000,000