Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock-based Compensation Expense (Details)

v3.20.1
Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Schedule of stock-based compensation expense    
Stock-based compensation $ 2,169 $ 2,063
Stock options [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation 541 554
RSAs and RSUs [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation 599 461
Performance Stock Units (PSUs) [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation 331 391
Performance Based Options (PBOs) [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation 698 657
Research and development [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation 424 388
Selling, General and Administrative Expenses [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation $ 1,745 $ 1,675