Stock Based Compensation, Share Option Valuation (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Stock Option Activity [Roll Forward]
Outstanding at beginning of period (in shares)	11,050,931
Granted (in shares)	1,243,509
Exercised (in shares)	(1,125,270)
Cancelled (in shares)	(128,473)
Outstanding at end of period (in shares)	11,040,697		11,050,931
Options vested and exercisable at end of period (in shares)	8,127,520
Options unvested at ending of period (in shares)	2,913,177
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 9.10
Granted (in dollars per share)	57.18
Exercised (in dollars per share)	8.76
Cancelled (in dollars per share)	34.15
Outstanding at end of period (in dollars per share)	14.27		$ 9.10
Options vested and exercisable at end of period (in dollars per share)	6.27
Options unvested at ending (in dollars per share)	$ 36.57
Weighted-Average Remaining Contractual Term [Abstract]
Outstanding	6 years 4 months 24 days		6 years 6 months 18 days
Granted	9 years 3 months 25 days
Options vested and exercisable	5 years 5 months 4 days
Options unvested	9 years 1 month 9 days
Aggregate Intrinsic Value [Abstract]
Outstanding at beginning of period	$ 504,079
Exercised	53,345
Outstanding at end of period	346,476		$ 504,079
Options vested and exercisable	$ 308,590
Weighted average grant date fair value of shares granted (in dollars per share)	$ 34.64	$ 14.29
Total fair value of options vested	$ 13,200	$ 30,000
Employees and Directors [Member]
Weighted-Average Assumptions [Abstract]
Risk-free interest rate	0.74%	1.27%
Expected term	5 years 10 months 2 days	5 years 10 months 2 days
Expected volatility	69.19%	77.39%
Expected dividend yield	0.00%	0.00%
Exercise price (in dollars per share)	$ 57.18	$ 21.56
Fair value of common stock (in dollars per share)	$ 57.18	$ 21.56