Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Stock-Based Compensation Expense (Details)

v3.19.3
Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of stock-based compensation expense        
Stock-based compensation $ 1,732 $ 1,770 $ 5,783 $ 6,207
Stock options [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation 545 472 1,680 1,482
RSAs and RSUs [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation 461 416 1,308 1,293
Performance Stock Units (PSUs) [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation 368 407 1,075 1,251
Performance Based Options (PBOs) [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation 358 475 1,720 2,181
Research and development [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation 458 552 1,249 1,555
Selling, General and Administrative Expenses [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation $ 1,274 $ 1,218 $ 4,534 $ 4,652