Annual report pursuant to Section 13 and 15(d)

Summary of Stock Option Activity (Detail)

v3.3.1.900
Summary of Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Outstanding Under Option, Options granted at market 0  
Number of Shares Outstanding Under Option, Beginning Balance   414,380
Number of Shares Outstanding Under Option, Options exercised 0 0
Weighted Average Exercise Price, Beginning Balance   $ 4.29
Number of Shares Outstanding Under Option, Options forfeited or expired (99,546)  
Number of Shares Outstanding Under Option, Ending Balance 314,834  
Weighted Average Exercise Price , Options granted at market $ 0  
Weighted Average Exercise Price, Options exercised 0  
Weighted Average Exercise Price, Options forfeited or expired 4.07  
Weighted Average Exercise Price, Ending Balance $ 4.36