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Shareholders' Deficit- Equity Table (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Class of Stock [Line Items]                
Balance $ (130,274) $ (121,019) $ (100,156) $ (56,298) $ (29,215) $ (2,814) $ (100,156) $ (2,814)
Warrants issued         1,424      
Exercise of stock options 3,326 1,600 108 3,844 2,190 687    
Stock-based compensation expense 3,496 3,598 3,374 2,929 3,000 2,966    
Net loss (16,463) (14,453) (24,345) (39,472) (33,697) (30,054) (55,261) (103,223)
Balance (139,915) (130,274) (121,019) (88,997) (56,298) (29,215) (139,915) (88,997)
Common Stock [Member]                
Class of Stock [Line Items]                
Balance 492 490 490 485 483 482 490 482
Exercise of stock options 3 2   5 2 1    
Balance 495 492 490 490 485 483 495 490
Additional Paid-in Capital [Member]                
Class of Stock [Line Items]                
Balance 558,157 552,961 549,479 530,336 523,724 520,072 549,479 520,072
Warrants issued         1,424      
Exercise of stock options 3,323 1,598 108 3,839 2,188 686    
Stock-based compensation expense 3,496 3,598 3,374 2,929 3,000 2,966    
Balance 564,976 558,157 552,961 537,104 530,336 523,724 564,976 537,104
Retained Earnings [Member]                
Class of Stock [Line Items]                
Balance (688,923) (674,470) (650,125) (587,119) (553,422) (523,368) (650,125) (523,368)
Net loss (16,463) (14,453) (24,345) (39,472) (33,697) (30,054)    
Balance $ (705,386) $ (688,923) $ (674,470) $ (626,591) $ (587,119) $ (553,422) $ (705,386) $ (626,591)