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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Financial Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2021
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair
​ |  | amount |  | value |  | amount |  | value
​ | ​ | (In thousands)
Cash and cash equivalents | ​ | $ | 70,637 | ​ | $ | 70,637 | ​ | $ | 76,579 | ​ | $ | 76,579
Accounts receivable, net | ​ |  | 10,731 | ​ |  | 10,731 | ​ |  | 15,546 | ​ |  | 15,546
Accounts payable | ​ |  | 2,632 | ​ |  | 2,632 | ​ |  | 3,408 | ​ |  | 3,408

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 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=123874694&loc=d3e19207-110258 + Details
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