Stockholders' Equity-Common and Preferred Shares - Summary of the Company's Stock Option Activity under its 2005 Plan (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Options outstanding, Beginning Balance	143	83	27
Shares, Granted	107	124	70
Shares, Forfeited and expired	(58)	(64)	(14)
Shares, Options outstanding, Ending Balance	192	143	83	27
Weighted Average Exercise Price, Options outstanding, Beginning Balance	$ 19.73	$ 70.06	$ 340.00
Shares, Options exercisable Ending Balance	108
Weighted Average Exercise Price, Granted	$ 3.90	$ 9.83	$ 12.62
Shares, Options vested or expected to vest Ending Balance	157
Weighted Average Exercise Price, Forfeited and expired	$ 14.38	$ 66.21	$ 304.52
Weighted Average Exercise Price, Options outstanding, Ending Balance	$ 12.54	$ 19.73	$ 70.06	$ 340.00
Weighted Average Exercise Price, Options exercisable Ending Balance	$ 16.56
Weighted Average Exercise Price, Options vested or expected to vest Ending Balance	$ 13.68
Weighted Average Remaining Contractual Life, Options Outstanding Beginning Balance	7 years 7 months 10 days	8 years 7 months 21 days	9 years 2 months 23 days	8 years 7 months 21 days
Weighted Average Remaining Contractual Life, Options exercisable Ending Balance	6 years 8 months 1 day
Weighted Average Remaining Contractual Life, Options vested or expected to vest Ending Balance	7 years 4 months 6 days
Aggregate Intrinsic Value, Options outstanding, Ending balance
Aggregate Intrinsic Value, Options exercisable Ending Balance
Aggregate Intrinsic Value, Options vested or expected to vest Ending Balance