Stock-Based Compensation - 2014 Employee Stock Purchase Plan (Details)				3 Months Ended		9 Months Ended		18 Months Ended
	Jan. 16, 2018 shares	Jan. 10, 2017 shares	Mar. 19, 2014 shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares	Nov. 20, 2017 item	Sep. 30, 2017 shares
2014 Employee Stock Purchase Plan
Stock-based compensation \| $				$ 1,235,000	$ 920,000	$ 3,619,000	$ 2,711,000
2014 Employee Stock Purchase Plan
2014 Employee Stock Purchase Plan
Term of the plan			10 years
Maximum annual increase in number of shares issuable by the plan, as a percentage of shares outstanding as of the preceding December 31			1.00%
Maximum number of shares to be issued over the term of the plan \| shares			4,000,000
Number of shares of common stock reserved under plan for issuance to employees \| shares			310,000	919,325		919,325			636,399
Stock-based compensation \| $				$ 73,000	$ 60,000	$ 146,000	$ 224,000
Additional shares authorized \| shares	409,224	267,565
Offering period						2 years
Number of purchase windows during each offering period \| item								4
Purchase price of common stock of the lower of the fair market value of the Company's common stock (as a percent)						85.00%
Assumptions used in estimating weighted average fair value of the shares expected to be purchased
Expected volatility, minimum						46.00%
Expected volatility, maximum						84.00%
Risk-free interest rate, minimum						1.08%
Risk-free interest rate, maximum						2.58%
Expected dividend rate (as a percent)						0.00%
Expected term, window one (in months)						6 months
Expected term, window two (in months)						12 months
Expected term, window three (in months)						18 months
Expected term, window four (in months)						24 months
Shares issued during the period \| shares						126,298	134,855
2014 Employee Stock Purchase Plan \| Minimum
Assumptions used in estimating weighted average fair value of the shares expected to be purchased
Fair value of common stock \| $ / shares				$ 4.82		$ 4.82
Grant Price \| $ / shares						$ 4.10
Expected term (in years)						6 months
2014 Employee Stock Purchase Plan \| Maximum
Assumptions used in estimating weighted average fair value of the shares expected to be purchased
Fair value of common stock \| $ / shares				$ 8.51		$ 8.51
Grant Price \| $ / shares						$ 7.23
Expected term (in years)						2 years

Corium International, Inc. 10-Q