Shareholders' Equity - Summary of Restricted Stock Unit Activity (Detail) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of Shares, Ending Balance	71,540
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of Shares, Beginning Balance	80,179
Granted, Number of Shares	50,728
Vested, Number of Shares	(50,391)
Forfeited, Number of Shares	(8,976)
Unvested, Number of Shares, Ending Balance	71,540
Expected to vest, Number of Shares, Ending Balance	68,810
Unvested, Weighted Average Grant Date Fair Value, Beginning Balance	$ 3.40
Granted, Weighted Average Grant Date Fair Value	6.32
Vested, Weighted Average Grant Date Fair Value	3.42
Forfeited, Weighted Average Grant Date Fair Value	3.15
Unvested, Weighted Average Grant Date Fair Value, Ending Balance	5.48
Expected to vest, Weighted Average Grant Date Fair Value, Ending Balance	$ 5.51