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Stockholders' Deficit - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Apr. 30, 2014	Apr. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options,Outstanding, December 31, 2014		1,380
Stock Options, Granted		150
Stock Options, Exercised		(33)
Stock Options, Forfeited		(200)
Stock Options,Outstanding, December 31, 2015	1,380	1,297
Stock Options,Exercisable, December 31, 2015		942
Stock Options,Expected to vest, December 31, 2015		1,296
Weighted Average Exercise Price, Outstanding, December 31, 2014		$ 7.70
Weighted Average Exercise Price, Granted	$ 3.62	7.17	$ 4.22	$ 3.03
Weighted Average Exercise Price, Exercised		4.85
Weighted Average Exercise Price, Forfeited		12.16
Weighted Average Exercise Price, Outstanding, December 31, 2015	$ 7.70	7.03
Weighted Average Exercise Price, Exercisable, December 31, 2015		7.47
Weighted Average Exercise Price, Expected to vest, December 31, 2015		$ 7.03
Weighted Average Remaining Contractual Term, Outstanding		5 years 6 months
Weighted Average Remaining Contractual Term, Exercisable		4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Expected to vest		5 years 6 months
Aggregate Intrinsic Value,Outstanding, December 31, 2015		$ 1,156
Aggregate Intrinsic Value, Exercisable, December 31, 2015		928
Aggregate Intrinsic Value,Expected to vest, December 31, 2015		$ 1,155

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

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