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Stock Plans - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Options    
Options outstanding at the beginning of the period (in shares) 4,922  
Options granted (in shares) 2,315  
Options exercised (in shares) 0  
Options cancelled (in shares) (2,814)  
Options outstanding at the end of the period (in shares) 4,423 4,922
Vested (in shares) 1,809  
Exercisable (in shares) 1,809  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 14.54  
Options granted (in dollars per share) 4.84  
Options exercised (in dollars per share) 0  
Options cancelled (in dollars per share) 14.32  
Balance at the end of the period (in dollars per share) 9.60 $ 14.54
Vested (in dollars per share) 15.38  
Exercisable (in dollars per share) $ 15.38  
Weighted-Average Remaining Contractual Term (Years)    
Outstanding 4 years 6 months 25 days  
Vested 2 years 7 months 2 days  
Exercisable 2 years 7 months 2 days  
Aggregate Intrinsic Value    
Outstanding $ 788,413.19  
Vested 0  
Exercisable 1,547.85  
Additional disclosures related to stock options    
Total intrinsic value for stock options exercised 0 $ 20,500
Total intrinsic value for stock options exercisable $ 1,500 $ 1,200