Income Tax Benefit (Details) $ in Millions	1 Months Ended
Nov. 30, 2016 USD ($)
Income Tax Benefit
Proceeds from sale of net operating losses to third party	$ 1.9

Represents the proceeds from participating in the New Jersey Technology Business Tax Certificate Transfer Program.

No definition available.

Name:	ctrv_NolCertificateTransfer
Namespace Prefix:	ctrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration