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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity |
Schedule of Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Shares Available | ​ | Compensation
(in thousands) | ​ | for Grant | ​ | Cost
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2016, 2017 and 2018 | ​ | ​ | 1,944,428 | ​ | ​ | ​
Shares granted 2019 | ​ | ​ | (38,046) | ​ | $ | 337,000
Balance December 31, 2019 | ​ | ​ | 1,906,382 | ​ | $ | 337,000

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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