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Stock-Based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2014
Employees
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Mar. 31, 2013
Employees
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Mar. 31, 2014
Non Employees
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Mar. 31, 2013
Non Employees
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Mar. 31, 2014
Two Thousand Three Plan
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Sep. 18, 2003
Two Thousand Three Plan
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Mar. 31, 2014
Two Thousand Three Plan
Maximum
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Dec. 31, 2010
Amended Two Thousand Three Plan
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Dec. 31, 2008
Amended Two Thousand Three Plan
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Dec. 31, 2007
Amended Two Thousand Three Plan
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Mar. 31, 2014
2013 Stock Incentive Plan
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Mar. 31, 2014
Employee Restricted Stock Plan
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Mar. 31, 2014
Restricted Stock
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Dec. 31, 2013
Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||
| Common stock reserved for future issuance | 450,000 | 1,160,000 | 810,000 | 670,000 | 2,000,000 | |||||||||||||
| Shares of common stock vested and exercisable | 406,353 | |||||||||||||||||
| Shares of common stock unvested | 667 | |||||||||||||||||
| Percentage of option price | 100.00% | |||||||||||||||||
| Stock option period | 10 years | 10 years | ||||||||||||||||
| Common stock vesting period | 3 years | 3 years | ||||||||||||||||
| Number of options exercised | 0 | 0 | 108,146 | |||||||||||||||
| Intrinsic value of outstanding exercisable options | $ 51,000 | $ 98,000 | ||||||||||||||||
| Weighted average term | 3 years | |||||||||||||||||
| Common stock reserved for future issuance | 0 | 1,257,500 | ||||||||||||||||
| Restricted shares forfeited under stock incentive plan | 36,000 | 26,000 | ||||||||||||||||
| Weighted average grant date fair value | $ 1.94 | |||||||||||||||||
| Shares available for issuance under stock incentive plan | 680,953 | 680,953 | 381,170 | 804,500 | ||||||||||||||
| Unrecognized compensation expense for restricted stock | 844,620 | 1,019,000 | ||||||||||||||||
| Stock-based compensation | $ 132,000 | $ 192,000 | $ 104,000 | $ 32,000 | $ 28,000 | $ 161,000 | ||||||||||||