Stock Based Awards and Other Equity Instruments - Summary of RSU Activity (Parenthetical) (Details) (Restricted Stock Units)	12 Months Ended
Dec. 31, 2014
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs withheld to satisfy minimum tax withholding requirements	103,641

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration