Annual report pursuant to Section 13 and 15(d)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies Details    
Expected term, minimum 5 years 9 months 5 days 5 years 9 months 5 days
Expected term, maximum 6 years 3 months 18 days 6 years 3 months 18 days
Volatility, minimum 51.00% 51.00%
Volatility, maximum 52.00% 58.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate Minimum 1.54% 1.49%
Risk-free interest rate Maximum 1.79% 2.14%