CONDENSED BALANCE SHEET (Unaudited)	Aug. 31, 2018 USD ($)
Current assets
Cash	$ 911,942
Prepaid expenses and other current assets	114,087
Total Current Assets	1,026,029
Marketable securities held in Trust Account	44,071,066
Total Assets	45,097,095
Current Liabilities
Accounts payable and accrued expenses	46,129
Total Current Liabilities	46,129
Deferred underwriting fees	978,556
Total Liabilities	1,024,685
Commitments
Ordinary shares subject to possible redemption, 3,899,442 shares at redemption value	39,072,409
Shareholders' Equity
Preferred shares, no par value; unlimited shares authorized, none issued and outstanding
Ordinary shares, no par value; unlimited shares authorized; 1,882,558 shares issued and outstanding (excluding 3,899,442 shares subject to possible redemption)	5,020,000
Accumulated deficit	(19,999)
Total Shareholders' Equity	5,000,001
Total Liabilities and Shareholders' Equity	$ 45,097,095

Represents information related to deferred underwriting fees.

No definition available.

Name:	glacu_DeferredUnderwritingFees1
Namespace Prefix:	glacu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.