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Accounting for Stock-Based Compensation - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($) Tranche $ / shares shares	Jun. 30, 2016 USD ($) Tranche $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued | shares	374,900	1,088,050	2,364,200
Number of stock options issued | shares	272,900	1,140,200	4,920,267
Share-based Compensation Arrangement by Share-based Payment Award, Options,grant date fair value | $ / shares	$ 0.55	$ 0.63
Weighted average vesting period for unrecognized compensation cost				3 years
Unrecognized compensation cost, share-based compensation arrangements		$ 0
Number of equal tranches | Tranche	4	4
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to options	$ 400,000			$ 400,000
Tranche achievement date				2017-09
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	0			$ 0
Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	0			0
Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0			0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options,grant date fair value | $ / shares	$ 0.84	$ 0.91
Aggregate number of shares granted to awards, share-based compensation arrangements | shares	470,000	4,015,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award , vesting period	4 years	4 years	4 years
Fair value of the stock options granted , value	$ 100,000	$ 700,000	$ 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options,grant date fair value | $ / shares	$ 0.55	$ 0.62	$ 0.61
Unrecognized compensation cost related to options	$ 5,000,000			5,000,000
Stock Options | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock granted, share-based compensation arrangements	300,000	$ 2,500,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 300,000	$ 1,000,000	$ 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options,grant date fair value | $ / shares	$ 0.84	$ 0.91	$ 0.92
Unrecognized compensation cost related to non-option	$ 5,800,000			$ 5,800,000

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