Commitments and Contingencies - Additional Information (Detail) $ in Millions	Mar. 31, 2022 USD ($) LetterofCredit
Commitments And Contingencies Disclosure [Abstract]
Number of letters of credit \| LetterofCredit	2
Letters of credit as additional security for lease guarantees \| $	$ 0.6

Letters of credit as additional security for lease guarantees.

No definition available.

Name:	kld_LettersOfCreditAsAdditionalSecurityForLeaseGuarantees
Namespace Prefix:	kld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant