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Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity |
Summary of changes in Shareholders' Equity | The changes in shareholders’ equity for three months ended March 31, 2021 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional |  | ​ | ​ |  | Total
​ | Common Stock | ​ | Paid- In | ​ | Accumulated | ​ | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital |  | Deficit |  | Equity (Deficit)
Balance, December 31, 2020 | 34,612,054 | ​ | $ | 35 | ​ | $ | 519,143 | ​ | $ | (333,147) | ​ | $ | 186,031
Cumulative effect adjustment for adoption of ASU 2020-06 | — | ​ | ​ | — | ​ | ​ | (44,777) | ​ | ​ | 5,288 | ​ | ​ | (39,489)
Exercise of common stock options | 289,164 | ​ | ​ | — | ​ | ​ | 4,102 | ​ | ​ | — | ​ | ​ | 4,102
Issuance for employee stock purchase plan | 24,630 | ​ | ​ | — | ​ | ​ | 358 | ​ | ​ | — | ​ | ​ | 358
Vesting of restricted stock units ("RSUs") and performance share units ("PSUs") | 413,538 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs and PSUs | (135,562) | ​ | ​ | — | ​ | ​ | (3,508) | ​ | ​ | — | ​ | ​ | (3,508)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 6,879 | ​ | ​ | — | ​ | ​ | 6,879
Net income | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,662 | ​ | ​ | 15,662
Balance, March 31, 2021 | 35,203,824 | ​ | $ | 35 | ​ | $ | 482,197 | ​ | $ | (312,197) | ​ | $ | 170,035
​ The changes in shareholders’ equity for three months ended March 31, 2020 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional |  | ​ | ​ |  | Total
​ | Common Stock |  | Paid- In |  | Accumulated |  | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital | ​ | Deficit |  | Equity (Deficit)
Balance, December 31, 2019 | 33,678,840 | ​ | $ | 34 | ​ | $ | 447,297 | ​ | $ | (359,899) | ​ | $ | 87,432
Exercise of common stock options | 455,573 | ​ | ​ | — | ​ | ​ | 4,454 | ​ | ​ | — | ​ | ​ | 4,454
Issuance for employee stock purchase plan | 39,411 | ​ | ​ | — | ​ | ​ | 357 | ​ | ​ | — | ​ | ​ | 357
Vesting of RSUs | 195,280 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs | (63,064) | ​ | ​ | — | ​ | ​ | (1,358) | ​ | ​ | — | ​ | ​ | (1,358)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 4,951 | ​ | ​ | — | ​ | ​ | 4,951
Equity component of 2020 Convertible Notes, net of issuance costs of $1,773 | — | ​ | ​ | — | ​ | ​ | 44,777 | ​ | ​ | — | ​ | ​ | 44,777
Net income | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 450 | ​ | ​ | 450
Balance, March 31, 2020 | 34,306,040 | ​ | $ | 34 | ​ | $ | 500,478 | ​ | $ | (359,449) | ​ | $ | 141,063

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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