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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Federal Tax Rate 21.00% 21.00% 21.00%
State Tax Rate 2.80% 2.00% 3.10%
Non-deductible expenses (4.40%) (9.20%) (1.60%)
Research credit 6.20% 10.50% 7.20%
Stock-based compensation 13.90% 46.80% 88.60%
Change in valuation allowance 16.30% (123.40%) 0.00%
Deferred tax rate change (0.20%) 0.20% (0.30%)
Voxbone US 338(g) gain (8.90%) 0.00% 0.00%
Intangibles and deferred adjustments (40.20%) 0.00% 0.00%
Foreign rate differential 1.30% 0.00% 0.00%
Other 4.50% 0.30% (1.60%)
Total 12.30% (51.80%) 116.40%