Summary of Significant Accounting Policies - Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									$ (41,704)	$ 61,487	$ (72,601)
Net income (loss) from discontinued operations	$ 3,019	$ (1,635)	$ 79,160	$ (12,696)	$ (11)	$ (11)	$ (15)	$ (16)	$ 67,848	$ (52,900)	$ (8,255)
Denominator
Weighted average common shares outstanding, basic									21,449	17,825	13,571
Weighted average common shares outstanding, diluted									21,449	17,855	13,571
Basic net income (loss) per share, continuing operations, (in dollars per share)									$ (1.94)	$ 3.45	$ (5.35)
Basic net income (loss) per share, Discontinued operations, (in dollars per share)									3.16	(2.97)	(0.61)
Diluted net income (loss) per share, Continuing operations, (in dollars per share)									(1.94)	3.44	(5.35)
Diluted net income (loss) per share, Discontinued operations, (in dollars per share)									$ 3.16	$ (2.96)	$ (0.61)
Continuing Operations [Member]
Denominator
Weighted average common shares outstanding, basic									21,449	17,825	13,571
Common stock warrants									0	30	0
Weighted average common shares outstanding, diluted									21,449	17,855	13,571
Discontinued Operations [Member]
Denominator
Weighted average common shares outstanding, basic									21,449	17,825	13,571
Common stock warrants									0	30	0
Weighted average common shares outstanding, diluted									21,449	17,855	13,571