Accounting for Stock-Based Compensation - Additional Information (Detail)	3 Months Ended
Mar. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued \| shares	2,364,200
Number of stock options issued \| shares	4,920,267
Weighted average vesting period for unrecognized compensation cost	3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award , vesting period	4 years
Fair value of the stock options granted , value	$ 2,988,418
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 0.61
Unrecognized compensation cost related to non vested stock options	$ 5,700,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 2,175,064
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 0.92
Unrecognized compensation cost related to non vested stock options	$ 7,400,000

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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