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Stockholders' Equity - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Options, Number of Options [Roll Forward]
Outstanding, beginning of period (in shares)	47,221	17,577
Granted (in shares)		32,765
Forfeited (in shares)	(5,865)	(3,121)
Outstanding, end of period (in shares)	41,356	47,221	17,577
Exercisable (in shares)	26,774
Stock Options, Exercise Price per Share [Roll Forward]
Granted (in dollars per share)		$ 19.04
Stock Options, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 122.40	378.08
Granted (in dollars per share)		19.04
Forfeited (in dollars per share)	23.95	480.16
Outstanding, beginning of period (in dollars per share)	135.77	$ 122.40	$ 378.08
Exercisable (in dollars per share)	$ 199.31
Stock Options, Weighted Average Remaining Life Years [Abstract]
Outstanding	7 years 10 months 24 days	8 years 11 months 12 days	8 years 9 months 29 days
Exercisable	7 years 7 months 17 days
Minimum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 19.04	$ 19.84
Forfeited (in dollars per share)	19.04	19.04
Outstanding, end of period (in dollars per share)	19.84	19.04	$ 19.84
Exercisable (in dollars per share)	19.04
Maximum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	3,921.92	3,921.92
Forfeited (in dollars per share)	545.28	2,713.60
Outstanding, end of period (in dollars per share)	3,788.80	$ 3,921.92	$ 3,921.92
Exercisable (in dollars per share)	$ 3,788.80

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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