CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended					6 Months Ended				12 Months Ended
	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2020	[1]	Jun. 30, 2021	[2]	Jun. 30, 2020	[1]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues [Abstract]
Revenue	$ 86,238		$ 80,727	$ 62,264		$ 166,965		$ 122,317		$ 269,132	$ 203,965	$ 147,384
Cost of revenue:
Amortization expense	2,860		2,777	2,678		5,637		5,355		10,753	10,266	8,969
Total cost of revenue	19,342		17,256	13,628		36,598		28,643		61,008	55,962	49,318
Gross profit	66,896		63,471	48,636		130,367		93,674		208,124	148,003	98,066
Operating expenses:
Sales and marketing	32,617		30,167	20,781		62,784		43,785		98,885	73,103	53,749
Research and development	17,203		15,626	11,949		32,829		24,587		52,513	42,898	31,527
General and administrative	27,508		16,244	6,528		43,752		17,743		51,603	31,509	22,444
Amortization expense	5,623		5,627	5,634		11,250		11,308		22,575	22,416	21,491
Total operating expenses	82,951		67,664	44,892		150,615		97,423		225,576	169,926	129,211
Income (loss) from operations	(16,055)		(4,193)	3,744		(20,248)		(3,749)		(17,452)	(21,923)	(31,145)
Interest expense, net	(167)		(55)	(4,690)		(222)		(9,468)		(10,741)	(21,423)	(18,203)
Foreign currency transaction loss	(308)		(218)	(13)		(526)		(317)		(722)	(1,252)	(418)
Other income, net	0		0	36		0		91		91	220	221
Loss before income tax (provision) benefit	(16,530)		(4,466)	(923)		(20,996)		(13,443)		(34,037)	(44,378)	(49,545)
Income tax (provision) benefit	63		(123)	89		(60)		3,113		9,955	10,033	11,966
Net loss	$ (16,467)	[1]	$ (4,589)	$ (834)		$ (21,056)	[1]	$ (10,330)		$ (24,082)	$ (34,345)	$ (37,579)
Net loss per share, basic (in dollars per share)	$ (0.14)		$ (0.04)	$ (0.01)		$ (0.18)		$ (0.10)		$ (0.22)	$ (0.33)	$ (0.37)
Net loss per share, diluted (in dollars per share)	$ (0.14)		$ (0.04)	$ (0.01)		$ (0.18)		$ (0.10)		$ (0.22)	$ (0.33)	$ (0.37)
Weighted-average shares used to compute net loss per share, basic (in shares)	117,909,720		117,386,322	102,862,404		117,649,467		102,861,475		108,908,597	102,752,092	102,325,465
Weighted-average shares used to compute net loss per share, diluted (in shares)	117,909,720		117,386,322	102,862,404		117,649,467		102,861,475		108,908,597	102,752,092	102,325,465
Subscription
Revenues [Abstract]
Revenue	$ 80,718		$ 74,482	$ 58,600		$ 155,200		$ 112,804		$ 248,879	$ 175,118	$ 113,867
Cost of revenue:
Cost of revenue	13,875		12,014	8,740		25,889		17,988		39,529	31,457	24,099
Operating expenses:
Net loss										(24,082)
Services
Revenues [Abstract]
Revenue	3,929		4,003	2,632		7,932		6,719		14,519	19,014	20,201
Cost of revenue:
Cost of revenue	2,607		2,465	2,210		5,072		5,300		10,726	14,239	16,250
License
Revenues [Abstract]
Revenue	$ 1,591		$ 2,242	$ 1,032		$ 3,833		$ 2,794		$ 5,734	$ 9,833	$ 13,316

[1] Certain prior period amounts have been revised to correct immaterial errors. See Note 1 for more information.

[2] Includes the three months ended March 31, 2021, which has been revised to correct immaterial errors. See Note 1 for more information.