DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of New Accounting Pronouncements (Details) $ in Millions |
Jan. 01, 2017
USD ($)
|
|---|---|
| Accounting Standards Update 2016-09 | Accumulated Deficit | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Cumulative effect of new accounting principle in period of adoption | $ 0.2 |