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v3.20.4

Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Schedule II - Valuation and Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts | Schedule II — Valuation and Qualifying Accounts ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Additions | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Charged | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Balance at |  | (Credited) |  | Charged to |  | ​ | ​ |  | Balance at
​ | ​ | Beginning | ​ | to Costs and | ​ | Other | ​ | ​ | ​ | ​ | End of
Deducted from asset accounts: | ​ | of Period | ​ | Expenses | ​ | Accounts | ​ | Deductions | ​ | Period
​ | ​ | (in thousands)
Year ended December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | $ | 602 | ​ | $ | 140 | ​ | $ | — | ​ | $ | (6) | ​ | $ | 736
Valuation allowance in net deferred tax assets | ​ |  | 130,053 | ​ |  | 513 | ​ |  | — | ​ |  | (12,123) | ​ |  | 118,443
​ | ​ | $ | 130,655 | ​ | $ | 653 | ​ | $ | — | ​ | $ | (12,129) | ​ | $ | 119,179
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | $ | 270 | ​ | $ | 392 | ​ | $ | — | ​ | $ | (60) | ​ | $ | 602
Valuation allowance in net deferred tax assets | ​ |  | 114,955 | ​ |  | 15,098 | ​ |  | — | ​ |  | — | ​ |  | 130,053
​ | ​ | $ | 115,225 | ​ | $ | 15,490 | ​ | $ | — | ​ | $ | (60) | ​ | $ | 130,655
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | $ | 270 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 270
Valuation allowance in net deferred tax assets | ​ |  | 100,456 | ​ |  | 14,499 | ​ |  | — | ​ |  | — | ​ |  | 114,955
​ | ​ | $ | 100,726 | ​ | $ | 14,499 | ​ | $ | — | ​ | $ | — | ​ | $ | 115,225
​

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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