Quarterly report pursuant to Section 13 or 15(d)

Summary of Stock Option Activity (Detail)

v2.4.0.8
Summary of Stock Option Activity (Detail) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 22, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
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
Shares Available for Future Grant, Options granted at market       (52,500)  
Shares Available for Future Grant, Options exercised         108,146
Shares Available for Future Grant, Options forfeited or expired       8,000 191,637
Shares Available for Future Grant, Ending Balance   636,453   636,453 680,953
Number of Shares Outstanding Under Option, Beginning Balance       407,020 706,803
Number of Shares Outstanding Under Option, Options granted at market 52,500 52,500 0 52,500 0
Number of Shares Outstanding Under Option, Options exercised   0 0 0 (108,146)
Number of Shares Outstanding Under Option, Options forfeited or expired       (8,000) (191,637)
Number of Shares Outstanding Under Option, Ending Balance   451,520   451,520 407,020
Weighted Average Exercise Price, Beginning Balance       $ 4.52 $ 4.27
Weighted Average Exercise Price , Options granted at market $ 3.02     $ 2.32  
Weighted Average Exercise Price, Options exercised         $ 2.45
Weighted Average Exercise Price, Options forfeited or expired       $ 3.54 $ 4.76
Weighted Average Exercise Price, Ending Balance   $ 4.33   $ 4.33 $ 4.52