Stock-Based Compensation - Non-vested Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Outstanding at beginning of year (in shares)	1,191,125	1,546,500	1,688,500
Granted (in shares)	81,000	126,000	94,500
Outstanding at end of year (in shares)	1,039,750	1,191,125	1,546,500
Weighted- Average Exercise Price
Granted (in dollars per share)	$ 1.11	$ 1.54	$ 2.20
Non-Vested Stock Options
Number of Options
Outstanding at beginning of year (in shares)	0
Granted (in shares)	81,000
Vested (in shares)	(81,000)
Forfeited (in shares)	0
Outstanding at end of year (in shares)	0	0
Weighted- Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 0.00
Granted (in dollars per share)	1.11
Vested (in dollars per share)	1.11
Forfeited (in dollars per share)	0.00
Outstanding at end of year (in dollars per share)	$ 0.00	$ 0.00