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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Net operating losses $ 105,433 $ 79,035
Tax credit carryforward 18,981 11,152
Non qualifying stock options 12,096 9,150
Deferred rent   11,755
Operating lease liabilities 31,052  
Deferred revenue 59,713 1,706
Other 2,983 1,892
Total deferred tax assets 230,258 114,690
Valuation allowance (197,527) (100,906)
Deferred tax assets, net of valuation allowance 32,731 13,784
Deferred tax liabilities    
Tangible and intangible assets (5,760) (13,784)
ROU assets (26,971)  
Net deferred taxes $ 0 $ 0