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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Warrants | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 43,578 |  |  |
Beginning balance at Dec. 31, 2018 | $ 102,231 | $ 471,180 | $ 104 | $ (39) | $ (369,014)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Net loss | (2,844) |  |  |  | (2,844)
Compensation expense related to stock options and restricted stock units granted, net of forfeitures | 2,628 | $ 2,628 |  |  |
Stock option exercises (in shares) |  | 228 |  |  |
Stock option exercises | 780 | $ 780 |  |  |
Shares issued under the Employee Stock Purchase Plan (in shares) |  | 19 |  |  |
Shares issued under the Employee Stock Purchase Plan | 218 | $ 218 |  |  |
Unrealized gain on investments | 42 |  |  | 42 |
Ending balance (in shares) at Mar. 31, 2019 |  | 43,825 |  |  |
Ending balance at Mar. 31, 2019 | 103,055 | $ 474,806 | 104 | 3 | (371,858)
Beginning balance (in shares) at Dec. 31, 2019 |  | 44,864 |  |  |
Beginning balance at Dec. 31, 2019 | 111,091 | $ 489,749 | 0 | 21 | (378,679)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Net loss | (4,705) |  |  |  | (4,705)
Compensation expense related to stock options and restricted stock units granted, net of forfeitures | 3,768 | $ 3,768 |  |  |
Stock option exercises (in shares) |  | 57 |  |  |
Stock option exercises | 196 | $ 196 |  |  |
Shares issued under the Employee Stock Purchase Plan (in shares) |  | 20 |  |  |
Shares issued under the Employee Stock Purchase Plan | 224 | $ 224 |  |  |
Issuance of stock upon restricted stock unit vesting (in shares) |  | 36 |  |  |
Issuance of stock upon restricted stock unit vesting | 0 |  |  |  |
Restricted stock withheld for employee tax remittance (in shares) |  | (14) |  |  |
Restricted stock withheld for employee tax remittance | (163) | $ (163) |  |  |
Unrealized gain on investments | 41 |  |  | 41 |
Ending balance (in shares) at Mar. 31, 2020 |  | 44,963 |  |  |
Ending balance at Mar. 31, 2020 | $ 110,452 | $ 493,774 | $ 0 | $ 62 | $ (383,384)

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