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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
(In thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
General and administrative | ​ | $ | 474 | ​ | $ | 1,452 | ​ | $ | 1,079 | ​ | $ | 3,621
Schedule of unrecognized stock-based compensation cost | As of June 30, 2019, unrecognized stock-based compensation cost was as follows: ​
​ | ​ | ​ | ​
​ | ​ | Unrecognized
​ | ​ | Compensation
(In thousands) |  | Cost
RSUs | ​ | $ | 1,095
RSAs | ​ | ​ | 1,192
Total unrecognized compensation cost | ​ | $ | 2,287
​

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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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