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Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Total Restricted Stock Units      
Non-vested at beginning of period (in shares) 11,301    
Vested (in shares) (10,310)    
Non-vested at end of period (in shares) 991    
Weighted-Average Grant Date Fair Value Per Share      
Nonvested, weighted average grant date fair value at end of period (in USD per share) $ 15.38    
Vested, weighted average grant date fair value (in USD per share) 9.76    
Nonvested, weighted average grant date fair value at end of period (in USD per share) $ 73.84    
Equity instruments other than options, aggregate intrinsic value, nonvested $ 14,062   $ 14,013
Equity instruments other than options, aggregate intrinsic value, vested 22,875    
Equity instruments other than options, vested in period, fair value $ 100,585 $ 169,563