Condensed Balance Sheets - USD ($)	May 31, 2019	Nov. 30, 2018
Current assets
Cash	$ 344,842	$ 644,700
Prepaid expenses and other current assets	52,808	84,545
Total Current Assets	397,650	729,245
Marketable securities held in Trust Account	44,829,414	44,307,387
Total Assets	45,227,064	45,036,632
Current liabilities
Accounts payable and accrued expenses	44,775	31,278
Promissory note - related party	250,000
Total Current Liabilities	294,775	31,278
Deferred underwriting fees	995,676	979,487
Total Liabilities	1,290,451	1,010,765
Commitments
Ordinary shares subject to possible redemption, 3,821,622 and 3,875,458 shares at redemption value as of May 31, 2019 and November 30, 2018, respectively	38,936,612	39,025,866
Shareholders' Equity
Preferred shares, no par value; unlimited shares authorized, none issued and outstanding
Ordinary shares, no par value; unlimited shares authorized; 1,960,378 and 1,906,542 shares issued and outstanding (excluding 3,821,622 and 3,875,458 shares subject to possible redemption) as of May 31, 2019 and November 30, 2018, respectively	5,156,039	5,066,785
Accumulated deficit	(156,038)	(66,784)
Total Shareholders' Equity	5,000,001	5,000,001
Total Liabilities and Shareholders' Equity	$ 45,227,064	$ 45,036,632

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.