FAIR VALUE MEASUREMENTS (Details) - USD ($)	Jun. 30, 2018	Mar. 31, 2018
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Marketable securities held in Trust Account	$ 146,952,108	$ 146,350,150

Fair value of investments which classified as cash and marketable securities held in Trust Account.

No definition available.

Name:	cnacu_CashAndMarketableSecuritiesHeldInTrustAccountFairValueDisclosure
Namespace Prefix:	cnacu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant