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Warrants and Derivative Liabilities - Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended						1 Months Ended
	Apr. 04, 2012	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 20, 2012 Post-Modification	Dec. 20, 2012 Pre-Modification
Principal outstanding (000’s)	$ 25,000	$ 10,411	$ 14,389	$ 15,380	$ 20,944	$ 24,074	$ 25,000	$ 20,944	$ 24,074
Stock price	$ 3.97	$ 2.34	$ 2.64	$ 2.67	$ 2.62	$ 4.15	$ 4.68	$ 2.95	$ 2.95
Percentage volume condition met	85.90%	80.20%	87.50%	80.50%	94.50%	51.00%	75.20%	94.90%	28.60%
Expected volatility	75.00%	66.30%	65.80%	66.90%	73.50%	70.00%	71.00%	72.50%	72.50%
Risk free interest rate	0.44%	1.00%	0.21%	0.20%	0.23%	0.23%	0.33%	0.25%	0.25%
Bond yield	15.00%	15.50%	16.70%	16.50%	16.50%	15.00%	16.00%	16.50%	16.50%
Recovery rate	30.00%	35.00%	37.00%	30.00%	30.00%	30.00%	30.00%	30.00%	30.00%
Redeemable	yes	yes	yes	yes	yes	yes	yes	yes	yes
Total time (years)	2 years 6 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 11 days	1 year 9 months 15 days	1 year 9 months 15 days
Dilution effect	yes	yes	yes	yes	yes	yes	yes	yes	yes
Fair value	$ 3,800	$ 181	$ 500	$ 529	$ 1,000	$ 2,800	$ 4,500	$ 1,500	$ 900
Fair value as a percent of par	15.10%	7.00%	3.30%	3.40%	4.90%	11.40%	17.90%	7.10%	3.90%

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Price of a single share of a number of saleable stocks of a company.

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