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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									5,231	529	1,244
Numerator
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									$ (68,686)	$ (41,704)	$ 61,487
Net loss (income) from discontinued operations	$ 109	$ (379)	$ (582)	$ (169)	$ 3,019	$ (1,635)	$ 79,160	$ (12,696)	$ (1,021)	$ 67,848	$ (52,900)
Denominator
Weighted average common shares outstanding, basic									24,785	21,449	17,825
Weighted average common shares outstanding, diluted											17,855
Basic net income (loss) per share, continuing operations, (in dollars per share)									$ (2.77)	$ (1.94)	$ 3.45
Basic net income (loss) per share, Discontinued operations, (in dollars per share)									(0.04)	3.16	(2.97)
Diluted net income (loss) per share, Continuing operations, (in dollars per share)									(2.77)	(1.94)	3.44
Diluted net income (loss) per share, Discontinued operations, (in dollars per share)									$ (0.04)	$ 3.16	$ (2.96)
Continuing Operations [Member]
Denominator
Weighted average common shares outstanding, basic									24,785	21,449	17,825
Common stock warrants									0	0	30
Weighted average common shares outstanding, diluted									24,785	21,449	17,855
Discontinued Operations [Member]
Denominator
Common stock warrants									0	0	30
Weighted average common shares outstanding, diluted									24,785	21,449	17,855
Common Stock Options And Restricted Stock Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									3,256	529	1,244