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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Jan. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares
Employee Stock Purchase 2015 Plan |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  | $ 38.44 | $ 2.63 |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  |  |  |  | 50.00% |
Period of plan |  |  |  |  | 8 years |
Ratio of bonus shares granted to participant |  |  |  |  | 0.1 |
Stock based compensation expense | $ |  |  |  |  | $ 0.3 | $ 0.3
Unrecognized compensation expense | $ |  |  |  |  | $ 2.3 | $ 2.9
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 1,840,336 | 2,293,120
Exercised (in shares) | shares |  |  |  |  | (425,076) | (49,320)
Outstanding shares at the end of the period | shares |  |  |  |  | 1,415,260 | 2,243,800
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 2.63 | $ 2.63
Exercised (in dollars per share) |  |  |  |  | 2.63 | 2.63
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  | $ 2.63 | $ 2.63
Employee Stock Purchase 2018 Plan |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) | $ 37.89 | $ 1.86 |  |  |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  |  |  |  | 50.00% |
Period of plan |  |  |  |  | 8 years |
Ratio of bonus shares granted to participant |  |  |  |  | 0.1 |
Stock based compensation expense | $ |  |  |  |  | $ 0.2 |
Unrecognized compensation expense | $ |  |  |  |  | $ 3.4 |
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 2,782,424 |
Outstanding shares at the end of the period | shares |  |  |  |  | 2,782,424 |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 1.86 |
Exercised (in dollars per share) |  |  |  |  | 1.86 |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  | $ 1.86 |

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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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