Stockholders’ Equity - Narrative (Details)	3 Months Ended	63 Months Ended
	Dec. 31, 2017 item shares	Dec. 31, 2017 shares
RSUs
Stockholders' Equity
Number of units awarded (in shares)		2,244,188
Number of shares of common stock that each award holder has the contingent right to receive	1
Vested awards to date	621,394	621,394
Expected awards vested (in shares)	502,530
Time-based RSUs
Stockholders' Equity
Number of units awarded (in shares)		1,071,724
Number of equal installments for vesting of stock awards | item	4
Performance-based RSUs
Stockholders' Equity
Number of units awarded (in shares)		1,172,464
Vesting period	3 years
Number of vesting criteria which have to be satisfied out of total vesting criteria | item	1
Number of vesting criteria | item	3