Stock-Based Compensation (Detail) - Stock Option Activity $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Number of Options (in shares):
Beginning balance (in shares) | shares	1,191,125
Granted (in shares) | shares	81,000
Exercised (in shares) | shares	0
Expired or forfeited (in shares) | shares	(150,375)
Ending balance (in shares) | shares	1,121,750
Exercisable (in shares) | shares	1,121,750
Weighted-Average Exercise Price (in dollars per share):
Beginning balance (in dollars per share) | $ / shares	$ 10.48
Granted (in dollars per share) | $ / shares	1.58
Exercised (in dollars per share) | $ / shares	0.00
Expired or forfeited (in dollars per share) | $ / shares	15.79
Ending balance (in dollars per share) | $ / shares	9.12
Exercisable (in dollars per share) | $ / shares	$ 9.12
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 26 days
Exercisable, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 26 days
Outstanding, Aggregate Intrinsic Value | $	$ 0
Exercisable, Aggregate Intrinsic Value | $	$ 0