Fair Value of Financial Instruments - Summary of Level 3 Inputs to Monte Carlo (Detail) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Apr. 02, 2014 shares $ / shares	Jan. 24, 2013 $ / shares	Jan. 24, 2013 shares $ / shares	Dec. 31, 2015 USD ($) shares $ / shares	Dec. 31, 2014 USD ($) $ / shares	Apr. 01, 2014 $ / shares
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Stock price (in dollars per share)	$ 11.00
2018 Notes | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Stock price (in dollars per share)				$ 2.48	$ 2.58
Estimated credit spread				46.85%	24.50%
Estimated stock volatility (percent)				55.00%	55.00%
2018 Notes | Convertible Senior Subordinated Notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative Liability | $				$ 26	$ 35
Conversion rate | shares			121.1240	121.1240
Conversion price (in dollars per share)		$ 8.26	$ 8.26	$ 8.26
Maturity date		Feb. 01, 2018		Feb. 01, 2018
Maturity date of early payment feature				Nov. 01, 2016
2019 Notes | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Stock price (in dollars per share)				$ 2.48	$ 2.58
Estimated credit spread				39.78%	29.00%
Estimated stock volatility (percent)				55.00%	55.00%
2019 Notes | Convertible Senior Subordinated Notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative Liability | $				$ 56	$ 48
Conversion rate | shares	75.7576			75.7576
Conversion price (in dollars per share)				$ 13.20		$ 13.20
Maturity date				Oct. 01, 2019
Maturity date of early payment feature				Jan. 01, 2018