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STOCKHOLDERS' EQUITY - Stock Options (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) $ / shares shares
Stock-based compensation |  |  |
Exercise of stock options | $ 323 |  |
2016 Incentive Plan | Stock options |  |  |
Stock-based compensation |  |  |
Granted (in shares) | shares |  | 0 | 1,200,000
Granted (in dollars per share) | $ / shares |  |  | $ 5.65
Proceeds from exercise of stock options |  |  | $ 300
Unrecognized compensation expense stock option |  | $ 200 | $ 7,100
Weighted average remaining vesting period |  | 9 months 18 days | 1 year 1 month 6 days
2016 Incentive Plan | Stock options | Employee |  |  |
Stock-based compensation |  |  |
Vesting period |  | 3 years |
Percentage of awards vesting on the annual anniversary date of the grant |  | 33.33 |
Expiration term |  | 10 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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