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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, 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 |  |  |  |
[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 10K for the year ended December 31, 2019.

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