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Stock-Based Awards - Summary of Information on Stock Options Outstanding (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Options Outstanding, Shares | 1,368,247 | 1,544,597 | 5,330,070 | 7,844,691
Options Outstanding, Weighted Average Remaining Life | 2 years 9 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.82 | $ 2.62 | $ 1.61 | $ 1.29
Options Exercisable, Shares | 1,330,747 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 2 years 9 months 18 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 2.76 |  |  |
$0.70 - $0.70 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 0.70 |  |  |
Range of Exercise Prices, high | $ 0.70 |  |  |
Options Outstanding, Shares | 435,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 years 1 month 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 0.70 |  |  |
Options Exercisable, Shares | 435,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 2 years 1 month 6 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0.70 |  |  |
$1.07 - $1.07 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 1.07 |  |  |
Range of Exercise Prices, high | $ 1.07 |  |  |
Options Outstanding, Shares | 93,535 |  |  |
Options Outstanding, Weighted Average Remaining Life | 1 year |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.07 |  |  |
Options Exercisable, Shares | 93,535 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 1 year |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 1.07 |  |  |
$2.09 - $2.26 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 2.09 |  |  |
Range of Exercise Prices, high | $ 2.26 |  |  |
Options Outstanding, Shares | 390,176 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 years 4 months 24 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.20 |  |  |
Options Exercisable, Shares | 390,176 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 2 years 4 months 24 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 2.20 |  |  |
$5.05 - $5.05 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 5.05 |  |  |
Range of Exercise Prices, high | $ 5.05 |  |  |
Options Outstanding, Shares | 285,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 1 month 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 5.05 |  |  |
Options Exercisable, Shares | 247,500 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 1 month 6 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 5.05 |  |  |
$6.36 - $6.82 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 6.36 |  |  |
Range of Exercise Prices, high | $ 6.82 |  |  |
Options Outstanding, Shares | 74,536 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 4 months 24 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.46 |  |  |
Options Exercisable, Shares | 74,536 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 4 months 24 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 6.46 |  |  |
$7.01 - $8.51 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Range of Exercise Prices, low | 7.01 |  |  |
Range of Exercise Prices, high | $ 8.51 |  |  |
Options Outstanding, Shares | 90,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 8 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 7.48 |  |  |
Options Exercisable, Shares | 90,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 8 months 12 days |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 7.48 |  |  |

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