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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands | Convertible Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  | $ 65 | $ 1,211,122 | $ (1,192,402) | $ 18,785 |
Balance (in shares) at Dec. 31, 2018 | 6 | 8,691 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Exercise of stock options |  |  | 115 |  | 115 |
Exercise of stock options (in shares) |  | 24 |  |  |  |
Issuance of common stock related to 401(k) contribution |  |  | 102 |  | 102 |
Issuance of common stock related to 401(k) contribution (in shares) |  | 7 |  |  |  |
Vesting of restricted stock units (in shares) |  | 2 |  |  |  |
Stock-based compensation expense |  |  | 1,728 |  | 1,728 |
Issuance of common stock |  |  | 66 |  | 66 |
Net income (loss) and comprehensive income loss |  |  |  | 3,233 | 3,233 |
Balance at Mar. 31, 2019 |  | $ 65 | 1,213,133 | (1,189,169) | 24,029 |
Balance (in shares) at Mar. 31, 2019 | 6 | 8,724 |  |  |  |
Balance at Dec. 31, 2018 |  | $ 65 | 1,211,122 | (1,192,402) | 18,785 |
Balance (in shares) at Dec. 31, 2018 | 6 | 8,691 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) and comprehensive income loss |  |  |  |  | (839) |
Balance at Jun. 30, 2019 |  | $ 65 | 1,214,168 | (1,193,241) | 20,992 |
Balance (in shares) at Jun. 30, 2019 | 6 | 8,728 |  |  |  |
Balance at Mar. 31, 2019 |  | $ 65 | 1,213,133 | (1,189,169) | 24,029 |
Balance (in shares) at Mar. 31, 2019 | 6 | 8,724 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Exercise of stock options |  |  | 8 |  | 8 |
Exercise of stock options (in shares) |  | 2 |  |  |  |
Issuance of common stock related to ESPP |  |  | 16 |  | 16 |
Issuance of common stock related to ESPP (in shares) |  | 2 |  |  |  |
Stock-based compensation expense |  |  | 1,011 |  | 1,011 |
Net income (loss) and comprehensive income loss |  |  |  | (4,072) | (4,072) |
Balance at Jun. 30, 2019 |  | $ 65 | 1,214,168 | (1,193,241) | 20,992 |
Balance (in shares) at Jun. 30, 2019 | 6 | 8,728 |  |  |  |
Balance at Dec. 31, 2019 |  | $ 73 | 1,238,299 | (1,194,384) | 43,988 | [1]
Balance (in shares) at Dec. 31, 2019 | 6 | 9,759 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Issuance of common stock related to 401(k) contribution |  |  | 88 |  | 88 |
Issuance of common stock related to 401(k) contribution (in shares) |  | 3 |  |  |  |
Stock-based compensation expense |  |  | 1,788 |  | 1,788 |
Disgorgement of stockholder's short-swing profits |  |  | 13 |  | 13 |
Net income (loss) and comprehensive income loss |  |  |  | (4,758) | (4,758) |
Balance at Mar. 31, 2020 |  | $ 73 | 1,240,188 | (1,199,142) | 41,119 |
Balance (in shares) at Mar. 31, 2020 | 6 | 9,762 |  |  |  |
Balance at Dec. 31, 2019 |  | $ 73 | 1,238,299 | (1,194,384) | 43,988 | [1]
Balance (in shares) at Dec. 31, 2019 | 6 | 9,759 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) and comprehensive income loss |  |  |  |  | (8,291) |
Balance at Jun. 30, 2020 |  | $ 83 | 1,240,987 | (1,202,675) | 38,395 |
Balance (in shares) at Jun. 30, 2020 | 5 | 11,018 |  |  |  |
Balance at Mar. 31, 2020 |  | $ 73 | 1,240,188 | (1,199,142) | 41,119 |
Balance (in shares) at Mar. 31, 2020 | 6 | 9,762 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Exercise of stock options |  |  | 10 |  | 10 |
Exercise of stock options (in shares) |  | 2 |  |  |  |
Issuance of common stock related to ESPP |  |  | 26 |  | 26 |
Issuance of common stock related to ESPP (in shares) |  | 1 |  |  |  |
Issuance of common stock related to Series Y preferred stock conversion |  | $ 10 | (10) |  |  |
Issuance of common stock related to Series Y preferred stock conversion (in shares) | (1) | 1,253 |  |  |  |
Stock-based compensation expense |  |  | 773 |  | 773 |
Net income (loss) and comprehensive income loss |  |  |  | (3,533) | (3,533) |
Balance at Jun. 30, 2020 |  | $ 83 | $ 1,240,987 | $ (1,202,675) | $ 38,395 |
Balance (in shares) at Jun. 30, 2020 | 5 | 11,018 |  |  |  |
[1] | The consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

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