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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-based Compensation (Details)
12 Months Ended
Dec. 31, 2016
Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of active stock based compensation plan 1
Percentages of stock option ownership considered for higher exercise price of option 10.00%
Option exercise price as percentages of closing exercise price 110.00%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expiration period of stock option plan 10 years
Vesting period of stock options 3 years
Option exercise price as percentages of closing exercise price 110.00%
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expiration period of stock option plan 5 years
Vesting period of stock options 2 years
Percentages of stock option ownership considered for higher exercise price of option 10.00%