Stock-Based Compensation and Stock Purchase Plans - Common Stock Warrants - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended				12 Months Ended		1 Months Ended						12 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended
	Jul. 28, 2011	Dec. 31, 2013	Dec. 31, 2012	Oct. 11, 2012	Dec. 31, 2011	Dec. 31, 2012 11% senior unsecured notes [Member]	Oct. 11, 2012 11% senior unsecured notes [Member]	Nov. 30, 2010 Class Of Warrant One [Member]	Nov. 30, 2010 Class Of Warrant Two [Member]	Nov. 30, 2010 Class Of Warrant Three [Member]	Oct. 11, 2012 Class Of Warrant Three [Member]	Nov. 30, 2010 Term Loan [Member]	Dec. 31, 2013 Senior Convertible Notes [Member]	Dec. 31, 2013 Tranche B [Member]	Jul. 28, 2011 Tranche B [Member]	Dec. 31, 2013 Tranche A [Member]	Oct. 11, 2012 Tranche A [Member]	Jul. 28, 2011 Tranche A [Member]	May 17, 2011 Tranche C [Member]	Dec. 31, 2013 Tranche C [Member]	Jul. 28, 2011 Tranche C [Member]	Nov. 30, 2010 Tranche C [Member]
Schedule Of Share Based Compensation Arrangements [Line Items]
Term loan facility closed												$ 60,000,000
Warrants exercisable issued							700,000	1,200,000	400,000	4,400,000	700,000
Issue price of warrants								15	15	15
Average closing bid price, percentage	120.00%								120.00%	120.00%
Warrant exercisable period	20 days													5 years
Warrants exercisable price	14.78														20.00		10.00	15.00			15.00
Number of trading days														20 days		20 days				20 days
Redemption price per warrants																			$ 0.01			$ 0.01
Redemption price of warrants																			44,000
Issuance of additional warrants		105,667	118,327		2,007
Exercise price per share of warrants					$ 5.71								$ 12.95
Minimum percentage of voting power of outstanding common stock, condition for fundamental change		50.00%
Debt instrument interest rate stated percentage				11.00%		11.00%
Warrants exercisable anniversary period			3 years
Adjustments to additional paid in capital, warrant issued			$ 2,572,000			$ 2,800,000