Quarterly report pursuant to Section 13 or 15(d)

PREPAID EXPENSES AND OTHER CURRENT ASSETS & INTANGIBLE ASSETS - Narrative (Details)

v3.10.0.1
PREPAID EXPENSES AND OTHER CURRENT ASSETS & INTANGIBLE ASSETS - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
May 15, 2018
patent
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets | $   $ 0.5 $ 0.2 $ 1.3 $ 0.2
Patent Assignment Agreement          
Finite-Lived Intangible Assets [Line Items]          
Patents, useful life       4 years  
Second Patent Assignment Agreement          
Finite-Lived Intangible Assets [Line Items]          
Patents, useful life       5 years  
Number of assets transferred | patent 56