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Equity | 3 Months Ended
--- | ---
Mar. 31, 2021
Stockholders' Equity |
Equity | ​ Note 7 — Equity ​ Statement of Stockholders’ Equity ​ The following tables present the changes in Stockholders’ Equity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | Common Stock | ​ | Paid-in | ​ | Accumulated | ​ | Comprehensive | ​ | ​ | ​
​ | ​ | Shares | ​ | Amount | ​ | Capital | ​ | Deficit | ​ | Income | ​ | Total
​ | ​ | (in thousands)
Balance at December 31, 2020 |  | 49,724 | ​ | $ | 497 | ​ | $ | 1,113,352 | ​ | $ | (707,321) | ​ | $ | 1,846 | ​ | $ | 408,374
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | 2,494 | ​ |  | — | ​ |  | 2,494
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (19) | ​ |  | (19)
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 3,237 | ​ |  | — | ​ |  | — | ​ |  | 3,237
Net issuance under employee stock plans |  | 459 | ​ | ​ | 5 | ​ | ​ | (1,630) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,625)
Balance at March 31, 2021 |  | 50,183 | ​ | $ | 502 | ​ | $ | 1,114,959 | ​ | $ | (704,827) | ​ | $ | 1,827 | ​ | $ | 412,461
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | Common Stock | ​ | Paid-in | ​ | Accumulated | ​ | Comprehensive | ​ | ​ | ​
​ | ​ | Shares | ​ | Amount | ​ | Capital | ​ | Deficit | ​ | Income | ​ | Total
​ | ​ | (in thousands)
Balance at December 31, 2019 |  | 48,994 | ​ | $ | 490 | ​ | $ | 1,071,058 | ​ | $ | (698,930) | ​ | $ | 1,894 | ​ | $ | 374,512
Net income (loss) |  | — | ​ |  | — | ​ |  | — | ​ |  | (567) | ​ |  | — | ​ |  | (567)
Other comprehensive income (loss), net of tax |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 153 | ​ |  | 153
Share-based compensation expense |  | — | ​ |  | — | ​ |  | 3,646 | ​ |  | — | ​ |  | — | ​ |  | 3,646
Net issuance under employee stock plans | ​ | 434 | ​ | ​ | 4 | ​ | ​ | (684) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (680)
Balance at March 31, 2020 |  | 49,428 | ​ | $ | 494 | ​ | $ | 1,074,020 | ​ | $ | (699,497) | ​ | $ | 2,047 | ​ | $ | 377,064
​ Accumulated Other Comprehensive Income (“AOCI”) ​ The following table presents the changes in the balances of each component of AOCI, net of tax: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​
​ | ​ | Foreign | ​ | on Available | ​ | ​ | ​
​ | ​ | Currency | ​ | for Sale | ​ | ​ | ​
​ |  | Translation |  | Securities |  | Total
​ | ​ | (in thousands)
Balance - December 31, 2020 | ​ | ​ | 1,866 | ​ | ​ | (20) | ​ | ​ | 1,846
Other comprehensive income (loss) | ​ |  | (30) | ​ |  | 11 | ​ |  | (19)
Balance - March 31, 2021 | ​ | $ | 1,836 | ​ | $ | (9) | ​ | $ | 1,827
​ There were minimal reclassifications from AOCI into net income for the three months ended March 31, 2021 and 2020.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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