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Employee Stock-Based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Summarizes restricted stock activity  
Shares, Nonvested, Beginning balance | shares 27
Shares, Vested | shares (14)
Shares, Nonvested, Ending balance | shares 13
Weighted Average Grant Date Fair Value, Nonvested, Beginning Balance | $ / shares $ 3.72
Weighted Average Grant Date Fair Value, Vested | $ / shares 3.72
Weighted Average Grant Date Fair Value, Nonvested, Ending Balance | $ / shares $ 3.72