NET LOSS PER SHARE (Detail Textuals)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Number of potentially dilutive shares upon the exercise of outstanding stock options	8,259,603	7,550,700

The number of potential common shares which were outstanding.

No definition available.

Name:	arql_NumberOfPotentiallyDilutiveSharesOnStockOptionsOutstanding
Namespace Prefix:	arql_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration