Stock Option Plans - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
December 31, 2013
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Dec. 31, 2012
December 31, 2014
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Dec. 31, 2012
December 31, 2015
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Dec. 31, 2012
Nineteen Ninety Four Plan
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Dec. 31, 2004
Nineteen Ninety Four Plan
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Dec. 31, 2012
Two Thousand Three Plan
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Sep. 18, 2003
Two Thousand Three Plan
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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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Dec. 31, 2012
Performance Based Stock Options
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Dec. 31, 2011
Performance Based Stock Options
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Dec. 31, 2010
Performance Based Stock Options
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||
Common stock reserved for future issuance | 450,000 | 450,000 | 1,160,000 | 810,000 | 670,000 | ||||||||||||
Shares of common stock vested and exercisable | 701,201 | 12,000 | 689,201 | ||||||||||||||
Percentage of option price | 100.00% | 100.00% | |||||||||||||||
Stock option period | 10 years | 10 years | |||||||||||||||
Vesting period | 5 years | 3 years | 3 years | ||||||||||||||
Grant date weighted average fair value options | $ 0.39 | $ 2.24 | $ 0.00 | $ 2.49 | |||||||||||||
Total intrinsic value | $ 0 | $ 0 | |||||||||||||||
Number of Shares Outstanding Under Option | 706,803 | 737,020 | 670,355 | 161,240 | 161,240 | 132,260 | |||||||||||
Weighted average exercise price of vested options outstanding | $ 4.29 | ||||||||||||||||
Weighted average remaining contractual term | 4 years 10 months 24 days | ||||||||||||||||
Aggregate intrinsic value | 0 | ||||||||||||||||
Future compensation cost related to non-vested awards | 601 | 314 | 58 | ||||||||||||||
Total fair value of shares vested | $ 157,939 | $ 253,000 |