Quarterly report pursuant to sections 13 or 15(d)

Summary of Stock Option Activity (Detail)

v2.4.0.8
Summary of Stock Option Activity (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Available for Future Grant, Beginning Balance 680,953 381,170 381,170
Shares Available for Future Grant, Options granted at market        
Shares Available for Future Grant, Options exercised     108,146
Shares Available for Future Grant, Options forfeited or expired     191,637
Shares Available for Future Grant, Ending Balance 680,953   680,953
Number of Shares Outstanding Under Option, Beginning Balance 407,020 706,803 706,803
Number of Shares Outstanding Under Option, Options granted at market        
Number of Shares Outstanding Under Option, Options exercised 0 0 (108,146)
Number of Shares Outstanding Under Option, Options forfeited or expired     (191,637)
Number of Shares Outstanding Under Option, Ending Balance 407,020   407,020
Weighted Average Exercise Price, Beginning Balance $ 4.52 $ 4.27 $ 4.27
Weighted Average Exercise Price , Options granted at market        
Weighted Average Exercise Price, Options exercised     $ 2.45
Weighted Average Exercise Price, Options forfeited or expired     $ 4.76
Weighted Average Exercise Price, Ending Balance $ 4.52   $ 4.52