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Fair-Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2019
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
​ | ​ | (In thousands)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money-market funds classified as non-current restricted cash and investments | ​ | $ | 1,154 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,154
Money-market funds classified as short-term investments | ​ |  | 18,481 | ​ |  | — | ​ |  | — | ​ |  | 18,481
Total | ​ | $ | 19,635 | ​ | $ | — | ​ | $ | — | ​ | $ | 19,635
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2018
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
​ | ​ | (In thousands)
Assets: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money-market funds classified as non-current restricted cash and investments | ​ | $ | 1,154 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,154
Money-market funds classified as short-term investments | ​ |  | 54,637 | ​ |  | — | ​ |  | — | ​ |  | 54,637
Total | ​ | $ | 55,791 | ​ | $ | — | ​ | $ | — | ​ | $ | 55,791
​

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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