Net Loss Per Common Share Data (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Equivalent Shares Excluded from Calculation of Diluted Net Loss Per Share
The following equivalent shares were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented:
Year Ended December 31,
20202019
Anti-dilutive equity awards:
Stock options6,672,102 7,553,379 
Restricted stock units919,296 447,886 
Performance based stock units372,675 119,116