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Accounting for Stock-Based Compensation - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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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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