STOCK OPTIONS (Details) - USD ($)			3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 16, 2015	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Stock option
Options available to purchase/Common Stock outstanding	2,473,417		2,473,417	2,473,417		2,606,737
Shares authorized for issuance	4,322,355		4,322,355	4,322,355
Exercisable period				6 years 29 days
Vesting period				6 years 2 months 11 days
Stock Options and Restricted Stock
Stock option
Stock-based compensation expense, net of forfeitures				$ 2,241,000	$ 1,596,000
Expected term of options granted	10 years
Vesting period				48 months
2007 Plan
Stock option
Options available to purchase/Common Stock outstanding	368,159		368,159	368,159
Shares available for future grants	0		0	0
2010 Plan
Stock option
Options available to purchase/Common Stock outstanding	2,105,258		2,105,258	2,105,258
Shares available for future grants	0		0	0
Shares authorized for issuance	322,355		322,355	322,355
Exercisable period			10 years
2015 plan
Stock option
Shares authorized for issuance	4,000,000		4,000,000	4,000,000
ESPP
Stock option
Shares authorized for employee stock purchase plan		$ 187,500
Maximum aggregate number of shares reserved for issuance during term of employee stock purchase plan		1,250,000