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Summary of Option Activity under Company's Equity Incentive Plans (Detail) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, Beginning Balance	140,990
Number of Shares Underlying Outstanding Options, Options forfeited	(15,495)
Number of Shares Underlying Outstanding Options, Ending Balance	125,495	140,990
Number of Shares Underlying Outstanding Options, Exercisable — March 31, 2017	93,959
Number of Shares Underlying Outstanding Options, Vested and expected to vest — March 31, 2017	125,495
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Beginning Balance	$ 127.56
Weighted- Average Exercise Price, Options forfeited	188.73
Weighted- Average Exercise Price, Ending Balance	120.00	$ 127.56
Weighted- Average Exercise Price, Exercisable — March 31, 2017	143.44
Weighted- Average Exercise Price, Vested and expected to vest — March 31, 2017	$ 120.00
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance	4 years 1 month 17 days	3 years 11 months 5 days
Weighted-Average Remaining Contractual Term (Years), Exercisable — March 31, 2017	2 years 6 months 29 days
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest — March 31, 2017	4 years 1 month 17 days

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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
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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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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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