Net Income (Loss) Per Share - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2011	Jun. 30, 2010
Components Of Income Before Taxes [Line Items]
Shares included in computation of diluted income per share		145,000
Outstanding options to purchase	4,500,000	1,237,000	1,595,000	4,500,000	4,561,000
Unvested restricted common stock yet not included	100,000		100,000	100,000
Options to purchase yet not included	4,500,000		1,600,000	4,500,000
Restricted Stock [Member]
Components Of Income Before Taxes [Line Items]
Shares included in computation of diluted income per share		17,000