Stockholders' Equity and Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Number of Shares
Outstanding, beginning balance (shares)	20,025,000
Granted (shares)	0
Exercised (shares)	(480,000)
Forfeited (shares)	(205,000)
Outstanding, ending balance (shares)	19,340,000	20,025,000
Vested and expected (shares)	17,278,000
Exercisable (shares)	9,529,000
Weighted-Average Exercise Price
Outstanding beginning balance (USD per share)	$ 8.51
Granted (USD per share)	0
Exercised (USD per share)	1.69
Forfeited (USD per share)	10.87
Outstanding ending balance (USD per share)	8.65	$ 8.51
Vested and expected to vest (USD per share)	8.14
Exercisable (USD per share)	$ 5.84
Weighted-Average Remaining Contractual Life (in Years)
Outstanding (in years)	7 years 6 months	7 years 9 months 18 days
Vested and expected to vest (in years)	7 years 4 months 24 days
Exercisable (in years)	6 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding	$ 53,286	$ 60,223
Vested and expected to vest	51,006
Exercisable	$ 37,083

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.