Organization and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands			12 Months Ended
	Feb. 12, 2019 USD ($) tranche item	May 24, 2018 USD ($) item tranche shares	Dec. 31, 2021 USD ($) segment item customer country shares	Dec. 31, 2020 USD ($) customer country shares	Dec. 31, 2019 USD ($) customer country shares
Summary Of Significant Accounting Policy [Line Items]
Credit losses			$ 0
Restricted cash balance			$ 57	$ 62
Number of revenue sources | item			2
Allowance for doubtful accounts			$ 3,349	3,376	$ 1,567
Additional credit loss expense			(46)	1,215
Sales, general and administrative			$ 515,007	307,286	212,959
Warranty period			1 year
Research and development costs			$ 194,026	123,195	$ 100,721
Number of depository institutions | item			3
Aggregate balances in depository institution accounts			$ 347,300
Cash surrender value of corporate-owned life insurance policies			$ 5,276	$ 4,654
Investment in number of unconsolidated affiliates | item			4
Number of reportable segments of company | segment			2
Market capitalization goal for such tranche		$ 2,500,000
Market capitalization goal increment		$ 1,000,000
Number of options, Granted (in shares) | shares			0	0	0
Net Sales | Geographic Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of countries outside the U.S. representing more than 10% of total net sales | country			0	0	0
Net Sales | Customer Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of major customers | customer			0	0	0
Accounts and notes receivable and contract assets | Customer Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of major customers | customer			0	0
Advertising
Summary Of Significant Accounting Policy [Line Items]
Sales, general and administrative			$ 2,600	$ 1,300	$ 900
Performance Shares
Summary Of Significant Accounting Policy [Line Items]
Number of options, Granted (in shares) | shares		6,365,856
Stock Options
Summary Of Significant Accounting Policy [Line Items]
Number of options, Granted (in shares) | shares			0	0	0
Chief Executive Officer
Summary Of Significant Accounting Policy [Line Items]
Number of vesting tranches of share-based awards | tranche		12
Number of performance goals, revenue | item		8
Number of performance goals, adjusted EBITDA | item		8
2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Restricted stock, expiration period	9 years
Number of vesting tranches of share-based awards | tranche	12
Market capitalization goal for such tranche	$ 2,500,000
Market capitalization goal increment	$ 1,000,000
Number of performance goals, revenue | item	8
Number of performance goals, adjusted EBITDA | item	8
Number of options, Granted (in shares) | shares			40,000
Post-vest holding period			2 years 6 months
Expected dividend yield (as percentage)			0.00%
Minimum | 2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Liquidity discount (as percentage)			10.50%
Risk-free interest rate (as percentage)			0.85%
Expected life of options			6 years 6 months
Expected volatility (as percentage)			47.28%
Maximum | 2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Number of options, Granted (in shares) | shares			100,000
Liquidity discount (as percentage)			17.60%
Risk-free interest rate (as percentage)			1.24%
Expected life of options			7 years
Expected volatility (as percentage)			55.79%
Design of New Headquarters
Summary Of Significant Accounting Policy [Line Items]
Impairment of long-lived assets to be disposed				$ 700
Capitalized software impairment					$ 1,300
Office Improvements and Remodeling
Summary Of Significant Accounting Policy [Line Items]
Impairment of long-lived assets to be disposed					$ 700
Impairment of leasehold				$ 500