Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018
Statement Of Stockholders Equity [Abstract]
Underwriters' discounts and commissions and offering costs	$ 1,705	$ 1,705

Underwriters' discounts and commissions and offering costs.

No definition available.

Name:	orbc_UnderwritersDiscountsAndCommissionsAndOfferingCosts
Namespace Prefix:	orbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration