Stockholders' Equity and Mezzanine Equity - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 25, 2015	Jan. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Stockholders Equity And Mezzanine Equity [Line Items]
Stock options, granted			140,000
Fully vested common stock granted			100,209
Compensation expense			$ 2,600,000	$ 1,600,000
Effect of employee stock purchase plan			347,000
Series A Preferred Stock
Stockholders Equity And Mezzanine Equity [Line Items]
Preferred stock redemption percentage	100.00%
Preferred units redeemed, value	$ 8,500,000
Preferred stock redemption call premium amount	$ 200,000
Preferred stock redemption call premium percentage	3.00%
Preferred stock redemption unpaid returns	$ 300,000
Employee Stock Purchase Plan
Stockholders Equity And Mezzanine Equity [Line Items]
Compensation expense			$ 100,000	$ 0
Employee stock purchase plan, shares issued		15,445
Shares price per share		$ 19.06
Effect of employee stock purchase plan					$ 200,000
Five Non Employee Directors
Stockholders Equity And Mezzanine Equity [Line Items]
Fully vested common stock granted			12,720	30,000
Compensation expense			$ 500,000	$ 400,000
Restricted Stock
Stockholders Equity And Mezzanine Equity [Line Items]
Stock options, granted			110,000	400,000
Unrecognized compensation expenses			$ 18,700,000
Weighted average life of remaining vesting period			2 years 4 months 24 days