Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Liabilities
Unrealized gains on investments		$ 14	$ 62
Total Deferred Tax Liabilities		14	62
Deferred Tax Assets
Charitable Contributions	$ 53	51	15
Accrued Expenses	1,857	1,318	759
Intangibles	783	883	983
Stock Compensation	24,335	16,812	10,943
Property, Plant & Equipment	80	68	13
Unrealized Loss on Investment	23
Net Operating Losses	47,864	27,933	17,635
Capitalized R&D	112,848	71,128	29,364
R&D Credit	23,799	14,205	6,141
Total deferred tax assets before valuation allowance	211,642	132,398	65,853
Valuation Allowance	(211,642)	(132,384)	(65,791)
Total deferred tax assets		$ 14	$ 62
Net deferred tax assets	$ 0