Equity Incentive Plans (Textual 3 RSU) - Additional Information (Detail) (USD $)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2011
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Vesting period of RSU awards in equal installments | 4 years | |
Fair value of common stock vested | $ 1,300,000 | |
Common shares received in payment of payroll taxes (shares) | 49,520 | |
Tax obligations paid in connection with settlement of restricted stock units | 196,000 | |
2006 Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Fair value of common stock vested, shares | 201,186 | 2,500 |
Service Restricted Stock Units
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Unrecognized compensation costs related to unvested awards, weighted average period | 2 years 2 months 12 days | |
Unrecognized compensation expenses related to unvested RSUs | $ 5,400,000 |