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Summary of Option Transactions (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Exercise Price      
Beginning Balance $ 10.88 $ 14.78 $ 20.63
Options granted     2.90
Options Forfeited / canceled / expired 3.85 26.08 26.24
Ending Balance 11.00 10.88 14.78
Exercisable at December 31 11.05 10.97 15.16
Ending Balance $ 11.00 $ 10.88 $ 14.78
No. of Shares      
Beginning Balance 229,000 308,000 613,000
Options granted     4,000
Options exercised 0 0 0
Options Forfeited / canceled / expired (4,000) (79,000) (309,000)
Ending Balance 225,000 229,000 308,000
Exercisable at December 31 224,000 227,000 298,000
Vested and expected to vest at December 31 225,000 229,000 308,000
Weighted- Average Remaining Contractual Term      
Balance at December 31 1 year 25 days    
Exercisable at December 31 1 year 10 days    
Vested and expected to vest at December 31 1 year 25 days    
Aggregate Intrinsic Value      
Balance at December 31 $ 0    
Exercisable at December 31 0    
Vested and expected to vest at December 31 $ 0