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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Estimated Useful Lives
Estimated useful lives by major asset category are as follows:
Manufacturing equipment10 years
Laboratory equipment7 years
Furniture and fixtures5 years
Software, computer and other equipment3 years
Leasehold improvementsLower of estimated useful life or term of lease
Property, plant and equipment, net consists of the following:
(in thousands)MARCH 31, 2020DECEMBER 31, 2019
Manufacturing equipment  $21,475  $18,073  
Laboratory equipment7,734  7,525  
Furniture and fixtures  1,663  1,648  
Software, computer and other equipment7,985  7,772  
Leasehold improvements  29,832  29,720  
Construction-in-progress663  3,892  
 Property, plant and equipment  69,352  68,630  
Less: Accumulated depreciation(12,129) (10,483) 
Property, plant and equipment, net  $57,223  $58,147  
Schedule of Computation of Diluted EPS
The potential common stock equivalents that have been excluded from the computation of Diluted EPS consist of the following:
 THREE MONTHS ENDED 
MARCH 31,
 20202019
Outstanding stock options8,701,163  7,444,736  
Stock purchase warrants4,500  79,500  
Non-vested restricted stock awards and performance share units633,865  781,903  
Non-vested restricted stock units30,938  —  
Total9,370,466  8,306,139