Net Loss Per Common Share - Reconciliation of Weighted-Average Shares Used for the Basic Computation and that Used for the Diluted Computation (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Weighted-average shares for basic	4,866,593	4,860,863	4,865,223	4,859,990
Dilutive effect of convertible preferred stock and stock options	122,296	74,327
Weighted-average shares for diluted	4,988,889	4,935,190	4,865,223	4,859,990