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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Provision for (benefit from) income taxes $ 38,428,000 $ (31,459,000) $ 420,000
Income tax examination, penalties and interest accrued 0 $ 0  
Federal      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net operating loss carryforwards 0    
Federal | Research tax credit carryforward      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Credit carryforwards 4,100,000    
State | Research tax credit carryforward      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net operating loss carryforwards 46,500,000    
Credit carryforwards 11,500,000    
Discontinued operations, disposed of by sale | MyCase      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Tax expense relating to the MyCase transaction 51,300,000    
Tax expense on gain of sale 52,300,000    
Benefit on reversal of tax liabilities $ 1,000,000.0