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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Summary of stock option activity

							Weighted
				Weighted			Average
				Average			Remaining		Aggregate
		Number of		Grant Date			Contractual		Intrinsic
		Shares		Fair Value			Life (Years)		Value
									(In thousands)
Outstanding at December 31, 2019		15,721,085		$	2.44		8.4		$	165,906
Granted		1,375,738			26.56
Exercised		(2,979,700)			1.82
Forfeited		(725,582)			3.14
Cancelled		(7,240)			1.42
Outstanding at December 31, 2020		13,384,301		$	5.03		7.7		$	500,053
Exercisable at December 31, 2019		4,349,090		$	0.96		7.4		$	52,367
Exercisable at December 31, 2020		7,343,948		$	2.02		7.1			296,496

Schedule of assumptions used in the option-pricing model for options granted

		Year Ended December 31
		2020		2019		2018
Expected term (in years)		5.50 - 6.11		5.63 - 6.28		5.38 - 6.10
Risk-free interest rate		0.3% - 1.7%		1.5% - 2.5%		2.6% - 3.1%
Expected volatility		49.2% - 54.7%		48.6% - 49.0%		48.1% - 48.9%
Expected dividend rate		—		—		—

Summary of restricted stock unit activity

					Weighted
		Number			Average
		of			Grant Date
		Shares			Fair Value
Outstanding at December 31, 2019		—		$	—
Granted		558,008		$	25.46
Vested		(48,096)		$	26.08
Forfeited		(20,845)		$	23.76
Outstanding at December 31, 2020		489,067		$	25.47

Summary of stock based compensation expense for employees

		Year Ended
		December 31
		2020			2019			2018
Cost of services		$	3,056		$	537		$	96
Selling and marketing			2,066			900			366
General and administrative			7,699			3,624			2,535
Total stock-based compensation expense		$	12,821		$	5,061		$	2,997

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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