Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Preferred Financing	Dec. 31, 2010 Preferred Financing	Dec. 31, 2013 Change in Control	Sep. 22, 2006 Change in Control
Income Taxes [Line Items]
Net operating loss carryforward annual limitation			$ 591		$ 8,135
Net operating loss carryforward expected to expire			6,025
Net operating loss expired			13,324
Net operating loss additional amount utilizable				4,044
Reversed portion of the valuation allowance related adjustment				1,375
Three-year cumulative percentage of company's common stock traded by large shareholders						50.00%
Deductions taken for tax purposes on stock option exercises	2,074	171
Tax benefit due to a change in tax law		$ 1,300