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Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2018 |  | 36,937,458 |  |
Beginning Balance at Dec. 31, 2018 | $ 49,390 | $ 428,903 | $ 15 | $ (379,528)
Stock issued under employee equity incentive plans (in shares) |  | 605,911 |  |
Stock issued under employee equity incentive plans | 315 | $ 315 |  |
Stock-based compensation expense | 1,689 | $ 1,689 |  |
Unrealized gain (loss) on available for sale securities | 4 |  | 4 |
Net income (loss) | 133 |  |  | 133
Ending Balance (in shares) at Mar. 31, 2019 |  | 37,543,369 |  |
Ending Balance at Mar. 31, 2019 | 51,531 | $ 430,907 | 19 | (379,395)
Beginning Balance (in shares) at Dec. 31, 2018 |  | 36,937,458 |  |
Beginning Balance at Dec. 31, 2018 | 49,390 | $ 428,903 | 15 | (379,528)
Net income (loss) | (4,621) |  |  |
Ending Balance (in shares) at Sep. 30, 2019 |  | 38,321,611 |  |
Ending Balance at Sep. 30, 2019 | 50,197 | $ 434,325 | 21 | (384,149)
Beginning Balance (in shares) at Mar. 31, 2019 |  | 37,543,369 |  |
Beginning Balance at Mar. 31, 2019 | 51,531 | $ 430,907 | 19 | (379,395)
Stock issued under employee equity incentive plans (in shares) |  | 290,422 |  |
Stock issued under employee equity incentive plans | 0 | $ 0 |  |
Stock-based compensation expense | 1,665 | $ 1,665 |  |
Unrealized gain (loss) on available for sale securities | 3 |  | 3 |
Net income (loss) | (2,448) |  |  | (2,448)
Ending Balance (in shares) at Jun. 30, 2019 |  | 37,833,791 |  |
Ending Balance at Jun. 30, 2019 | 50,751 | $ 432,572 | 22 | (381,843)
Stock issued under employee equity incentive plans (in shares) |  | 487,820 |  |
Stock issued under employee equity incentive plans | 255 | $ 255 |  |
Stock-based compensation expense | 1,498 | $ 1,498 |  |
Unrealized gain (loss) on available for sale securities | (1) |  | (1) |
Net income (loss) | (2,306) |  |  | (2,306)
Ending Balance (in shares) at Sep. 30, 2019 |  | 38,321,611 |  |
Ending Balance at Sep. 30, 2019 | 50,197 | $ 434,325 | 21 | (384,149)
Beginning Balance (in shares) at Dec. 31, 2019 |  | 38,434,488 |  |
Beginning Balance at Dec. 31, 2019 | 47,529 | $ 436,122 | 12 | (388,605)
Stock issued under employee equity incentive plans (in shares) |  | 815,375 |  |
Stock issued under employee equity incentive plans | 325 | $ 325 |  |
Stock-based compensation expense | 1,822 | $ 1,822 |  |
Unrealized gain (loss) on available for sale securities | (6) |  | (6) |
Net income (loss) | (5,399) |  |  | (5,399)
Ending Balance (in shares) at Mar. 31, 2020 |  | 39,249,863 |  |
Ending Balance at Mar. 31, 2020 | 44,271 | $ 438,269 | 6 | (394,004)
Beginning Balance (in shares) at Dec. 31, 2019 |  | 38,434,488 |  |
Beginning Balance at Dec. 31, 2019 | 47,529 | $ 436,122 | 12 | (388,605)
Net income (loss) | (20,090) |  |  |
Ending Balance (in shares) at Sep. 30, 2020 |  | 41,537,358 |  |
Ending Balance at Sep. 30, 2020 | 37,594 | $ 446,278 | 11 | (408,695)
Beginning Balance (in shares) at Mar. 31, 2020 |  | 39,249,863 |  |
Beginning Balance at Mar. 31, 2020 | 44,271 | $ 438,269 | 6 | (394,004)
At the market equity offering (in shares) |  | 803,528 |  |
At the market equity offering | 2,474 | $ 2,474 |  |
Stock issued under employee equity incentive plans (in shares) |  | 167,100 |  |
Stock issued under employee equity incentive plans | 12 | $ 12 |  |
Stock-based compensation expense | 2,243 | $ 2,243 |  |
Unrealized gain (loss) on available for sale securities | 7 |  | 7 |
Net income (loss) | (6,552) |  |  | (6,552)
Ending Balance (in shares) at Jun. 30, 2020 |  | 40,220,491 |  |
Ending Balance at Jun. 30, 2020 | 42,455 | $ 442,998 | 13 | (400,556)
At the market equity offering (in shares) |  | 570,989 |  |
At the market equity offering | 1,167 | $ 1,167 |  |
Stock issued under employee equity incentive plans (in shares) |  | 745,878 |  |
Stock issued under employee equity incentive plans | 263 | $ 263 |  |
Stock-based compensation expense | 1,850 | $ 1,850 |  |
Unrealized gain (loss) on available for sale securities | (2) |  | (2) |
Net income (loss) | (8,139) |  |  | (8,139)
Ending Balance (in shares) at Sep. 30, 2020 |  | 41,537,358 |  |
Ending Balance at Sep. 30, 2020 | $ 37,594 | $ 446,278 | $ 11 | $ (408,695)

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