Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Equity Incentive Plans (Details)

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Stockholders' Equity - Equity Incentive Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity Incentive Plans        
Stock-based compensation $ 768 $ 734 $ 2,315 $ 3,519
Research and Development Expense        
Equity Incentive Plans        
Stock-based compensation 179 208 603 952
General and Administrative Expense        
Equity Incentive Plans        
Stock-based compensation $ 589 $ 526 $ 1,712 $ 2,567
Maximum        
Equity Incentive Plans        
Term of award     10 years  
Vesting period     4 years