Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued in conjunction with the vesting and release of restricted stock units (in shares)		202,851	57,713
Common stock issued due to exercise of stock options (in shares)		291,555	222,378
Common stock issued in connection with employee stock purchase plan (in shares)		21,342	32,358
Proceeds from issuance of common stock		$ 5,652	$ 3,065
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		72,713			21,538
Payments related to tax withholding for share-based compensation		$ 3,200		$ 400
Share-based compensation expense recognized		2,936	1,921
Convertible Preferred Stock, Shares Issued upon Conversion	2,427,547
Extinguishment of Convertible Senior Notes through issuance of common stock		118,075	0
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		1,000	$ 1,100
Total unrecognized compensation expense related to non-vested stock options	$ 7,000	$ 7,000
Expected weighted-average period of recognition for unrecognized compensation expense		2 years 3 months 20 days
Weighted-average grant date fair value of stock options granted (in usd per share)		$ 18.76	$ 8.55
Stock options granted (in shares)		158,758	230,261
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 1,900	$ 800
Expected weighted-average period of recognition for unrecognized compensation expense		2 years 6 months
Total unrecognized compensation expense related to non-vested restricted stock	13,500	$ 13,500
Weighted-average grant date fair value of stock options granted (in usd per share)		$ 46.48	$ 21.06
Stock options granted (in shares)		184,377	289,338
Convertible Debt [Member] | Senior 3 Point 25 Percent Convertible Notes Due 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Extinguishment of Convertible Senior Notes through issuance of common stock	$ 70,200