Business Combinations - Additional Information (Details) $ / shares in Units, $ in Thousands, € in Millions, $ in Millions										3 Months Ended	6 Months Ended		12 Months Ended
	Aug. 09, 2021 NZD ($) shares	Jul. 01, 2021 EUR (€) shares	May 07, 2021 USD ($) $ / shares shares	Jan. 15, 2021 USD ($) $ / shares shares	Aug. 04, 2020 USD ($) $ / shares shares	May 27, 2020 USD ($) $ / shares shares	Mar. 19, 2020 USD ($) $ / shares shares	Feb. 25, 2020 USD ($) $ / shares shares	Feb. 07, 2020 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Cash paid											$ 197,666	$ 44,265
Contingent consideration										$ 18,775	$ 18,775		$ 10,619
Common stock reserved for future issuance | shares										5,900,000	5,900,000
xMatters Holdings, Inc
Business Acquisition [Line Items]
Date of acquisition of business			May 07, 2021
Total purchase price			$ 242,300								$ 229,747
Cash paid			$ 177,800
Number of newly issued common stock | shares			555,332
Common stock price per share | $ / shares			$ 116.12
Weighted average useful life of identified acquired intangible assets											8 years 1 month 17 days
Cash paid											$ 165,265
xMatters Holdings, Inc | General and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition transaction costs											1,500
Business acquisition expense											$ 600
xMatters Holdings, Inc | Acquired Technology
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years
xMatters Holdings, Inc | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											9 years
xMatters Holdings, Inc | Trade Names
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											5 years
Red Sky Technologies Inc.
Business Acquisition [Line Items]
Date of acquisition of business				Jan. 15, 2021
Total purchase price				$ 55,400							$ 64,568
Number of newly issued common stock | shares				162,820
Common stock price per share | $ / shares				$ 141.46
Weighted average useful life of identified acquired intangible assets											7 years 8 months 26 days
Cash paid				$ 32,400							$ 32,401
Contingent payment				30,000
Contingent consideration				$ 9,135
Red Sky Technologies Inc. | Maximum | General and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition transaction costs											$ 100
Red Sky Technologies Inc. | Acquired Technology
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years
Red Sky Technologies Inc. | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											9 years
Red Sky Technologies Inc. | Trade Names
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											4 years
Connexient
Business Acquisition [Line Items]
Date of acquisition of business									Feb. 07, 2020
Total purchase price									$ 20,200
Cash paid									$ 11,500
Number of newly issued common stock | shares									96,611
Common stock price per share | $ / shares									$ 93.32
Contingent payment									$ 6,000
CNL Software Limited
Business Acquisition [Line Items]
Date of acquisition of business								Feb. 25, 2020
Total purchase price								$ 35,700
Cash paid								$ 19,800
Number of newly issued common stock | shares								153,217
Common stock price per share | $ / shares								$ 104.10
One2Many Group B.V.
Business Acquisition [Line Items]
Date of acquisition of business							Mar. 19, 2020
Total purchase price							$ 13,100
Cash paid							$ 5,500
Number of newly issued common stock | shares							52,113
Common stock price per share | $ / shares							$ 104.95
Contingent payment							$ 15,000
Contingent consideration							2,200
Purchase liabilities							$ 2,000
Change in fair value of contingent consideration obligation											$ (700)
One2Many Group B.V. | Subsequent Event
Business Acquisition [Line Items]
Cash paid net of cash acquired | €		€ 4.1
Issuance of common stock for contingent consideration | shares		41,668
One2Many Group B.V. | Maximum
Business Acquisition [Line Items]
Change in fair value of contingent consideration obligation										$ 100
One2Many Group B.V. | Maximum | General and Administrative Expenses
Business Acquisition [Line Items]
Change in fair value of contingent consideration obligation										$ 100	(700)
Techwan SA
Business Acquisition [Line Items]
Date of acquisition of business						May 27, 2020
Total purchase price						$ 15,500					$ 17,300
Cash paid						$ 9,400
Number of newly issued common stock | shares						38,425
Common stock price per share | $ / shares						$ 132.05
Weighted average useful life of identified acquired intangible assets											7 years 5 months 19 days
Cash paid											$ 9,301
Contingent payment						$ 7,000
Contingent consideration						2,030
Purchase liabilities						$ 100
Common stock reserved for future issuance | shares						6,779
Techwan SA | General and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition transaction costs													200
Techwan SA | Acquired Technology
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years
Techwan SA | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											9 years
Techwan SA | Trade Names
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years
SnapComms Limited
Business Acquisition [Line Items]
Date of acquisition of business					Aug. 04, 2020
Total purchase price					$ 34,400						$ 32,971
Cash paid					$ 13,600
Number of newly issued common stock | shares					121,858
Common stock price per share | $ / shares					$ 145.13
Weighted average useful life of identified acquired intangible assets											7 years 9 months 25 days
Cash paid											$ 10,090
Contingent payment					$ 5,000
Contingent consideration					$ 2,047
Change in fair value of contingent consideration obligation											700
Issuance of common stock for contingent consideration | shares										6,188
SnapComms Limited | Subsequent Event
Business Acquisition [Line Items]
Cash paid	$ 2.5
Number of newly issued common stock | shares	12,390
SnapComms Limited | General and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition transaction costs													$ 100
SnapComms Limited | Maximum
Business Acquisition [Line Items]
Change in fair value of contingent consideration obligation										$ (100)
SnapComms Limited | Maximum | General and Administrative Expenses
Business Acquisition [Line Items]
Change in fair value of contingent consideration obligation										$ (100)	$ 700
SnapComms Limited | Acquired Technology
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years
SnapComms Limited | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											9 years
SnapComms Limited | Trade Names
Business Acquisition [Line Items]
Weighted average useful life of identified acquired intangible assets											3 years