Going Concern Consideration - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Going Concern [Line Items]
Accumulated deficit	$ 117,529	$ 116,328
Total stockholders' deficit	7,303	6,190
Cash and cash equivalents	40	243	3	1
Accounts payable, trade and accrued liabilities	1,682	1,634
Working capital balance	$ 8,096