Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | 0 Months Ended | ||
---|---|---|---|---|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Jan. 31, 2015
|
|
Subsequent Event [Line Items] | ||||
Underwritten offering price per share | $ 0.0001 | $ 0.0001 | ||
Net proceeds after deducting underwriting discounts, commissions and expenses payable | $ 112,837 | $ 113,155 | $ 9 | |
Subsequent Event [Member] | Underwriting Offering [Member] | ||||
Subsequent Event [Line Items] | ||||
Common stock issued and sold pursuant to underwriters option to purchase shares | 2,950,000 | |||
Underwritten offering, par value price per share | $ 0.0001 | |||
Underwritten offering price per share | $ 33.00 | |||
Net proceeds after deducting underwriting discounts, commissions and expenses payable | $ 90,868 |