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Severance and Other Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Severance Costs	$ 3.6	$ 4.0
Cash Payments for Severance and other related		$ 3.1	$ 4.1

X

- Definition

Cash Payments for Severance and other related

+ References

No definition available.

+ Details

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Namespace Prefix:	pro_
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Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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