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STOCKHOLDERS' EQUITY - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Total (in shares)	5,745,407	4,503,686
Common stock warrants
Class of Stock [Line Items]
Total (in shares)	17,331	17,331
Stock options and RSUs issued and outstanding
Class of Stock [Line Items]
Total (in shares)	4,352,640.00	3,099,173
Authorized for future stock awards under the Company's option plans
Class of Stock [Line Items]
Total (in shares)	789,288	1,006,307
Authorized for future issuance under the ESPP
Class of Stock [Line Items]
Total (in shares)	586,148	380,875