Shareholders' Equity - Information on Outstanding Expired Warrants (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Class of Warrant or Right [Line Items]
Weighted Average Exercise Price | $ / shares	$ 11.55
Warrants | shares	1,124,182
Warrant 1 [Member]
Class of Warrant or Right [Line Items]
Weighted Average Exercise Price | $ / shares	$ 10.80
Warrants | shares	502,907
Expiration Date	Jul. 02, 2015
Warrant 2 [Member]
Class of Warrant or Right [Line Items]
Weighted Average Exercise Price | $ / shares	$ 12.16
Warrants | shares	621,275
Expiration Date	Apr. 30, 2015