Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Convertible note receivable converted to preferred stock amount	$ 12,500,000
Proceeds from Conversion of Note Receivable		12,500,000
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Face value of note receivable		$ 25,000,000