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SUBSEQUENT EVENTS (Details) $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2015 patent | Mar. 24, 2015 patent | Mar. 06, 2015 USD ($) shares | Apr. 30, 2015 shares | Mar. 31, 2015 USD ($) ft² shares | Dec. 31, 2013 | Sep. 30, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Jul. 31, 2014 shares
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Principal amount converted | $ |  |  |  |  |  |  | $ 5,000 |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  | 1,197,452 |  |
Restricted stock granted (in shares) |  |  |  |  |  |  | 194,694 |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |
Common stock split ratio |  |  |  | 0.144927536 |  |  |  |  |
Office and research facility operating lease |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  | 19,335 |  |  |  |
Term of lease extension option |  |  |  |  | 5 years |  |  |  |
Office and research facility operating lease | Delivery of expansion space with substantial completion of certain improvements |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  | 5 years |  |  |  |
Amendment to office and research facility operating lease |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  | 9,660 |  |  |  |
2014 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for issuance (in shares) |  |  |  | 2,700,000 |  |  |  |  | 525,700
Restricted stock |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  |  |  |  | 10,869 |
Purdue Pharma, L. P. patent infringement suit, District of Delaware |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |
Number of patents asserted to have been infringed | patent |  | 4 |  |  |  |  |  |  |
Purdue Pharma, L. P., patent infringement suit, District of Massachusetts |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |
Number of patents asserted to have been infringed | patent | 4 |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock | Mandatory conversion, initial public offering | Minimum |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Gross proceeds from sale of stock | $ |  |  |  |  |  |  |  | $ 50,000 |
Series D convertible redeemable preferred stock |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Cash consideration from issuance of preferred stock | $ |  |  |  |  | $ 45,000 |  |  |  |
6.0% Convertible promissory notes |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Principal amount converted | $ |  |  |  |  | $ 5,000 |  |  |  |
Common stock |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |
Common stock split ratio |  |  |  |  |  | 0.5 |  |  |
Subsequent events | Office and research facility operating lease |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  | 19,335 |  |  |  |
Term of lease extension option |  |  |  |  | 5 years |  |  |  |
Subsequent events | Office and research facility operating lease | Delivery of expansion space with substantial completion of certain improvements |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  | 5 years |  |  |  |
Subsequent events | Amendment to office and research facility operating lease |  |  |  |  |  |  |  |  |
Lease |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  | 9,660 |  |  |  |
Subsequent events | 2014 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for issuance (in shares) |  |  |  |  | 1,087,005 |  |  |  |
Subsequent events | Employee stock options |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 638,095 |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |
Period from grant date to expiration |  |  |  |  | 10 years |  |  |  |
Subsequent events | Restricted stock |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  | 194,694 |  |  |  |  |
Subsequent events | Restricted stock | Vested upon grant |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  | 97,347 |  |  |  |  |
Subsequent events | Restricted stock | Vesting in monthly installments |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  | 97,347 |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |  |
Subsequent events | Purdue Pharma, L. P. patent infringement suit, District of Delaware |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |
Number of patents asserted to have been infringed | patent |  | 4 |  |  |  |  |  |  |
Subsequent events | Purdue Pharma, L. P., patent infringement suit, District of Massachusetts |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |
Number of patents asserted to have been infringed | patent | 4 |  |  |  |  |  |  |  |
Subsequent events | Private Placement | Investors | Series D convertible redeemable preferred stock |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  | 41,666,667 |  |  |  |  |  |
Aggregate consideration | $ |  |  | $ 50,000 |  |  |  |  |  |
Cash consideration from issuance of preferred stock | $ |  |  | 45,000 |  |  |  |  |  |
Subsequent events | Conversion of convertible notes into convertible preferred stock | Investors | 6.0% Convertible promissory notes |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Principal amount converted | $ |  |  | $ 5,000 |  |  |  |  |  |
Subsequent events | Conversion of convertible notes into convertible preferred stock | Investors | 6.0% Convertible promissory notes | Series D convertible redeemable preferred stock |  |  |  |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |
Number of shares of stock into which debt was converted (in shares) |  |  | 4,166,667 |  |  |  |  |  |

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