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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 389 | $ 297,319 | $ (150,726) | $ 146,982
Beginning Balance (in shares) at Dec. 31, 2018 | 38,900,875 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (22,097) | (22,097)
Stock-based compensation |  | 7,384 |  | 7,384
Issuance of restricted and performance stock units (in shares) | 41,340 |  |  |
Exercise of stock options and employee stock purchase plan | $ 6 | 3,136 |  | 3,142
Exercise of stock options and employee stock purchase plan (in shares) | 519,103 |  |  |
Ending Balance at Sep. 30, 2019 | $ 395 | 307,839 | (172,823) | 135,411
Ending Balance (in shares) at Sep. 30, 2019 | 39,461,318 |  |  |
Beginning Balance at Jun. 30, 2019 | $ 393 | 304,819 | (167,252) | 137,960
Beginning Balance (in shares) at Jun. 30, 2019 | 39,252,294 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (5,571) | (5,571)
Stock-based compensation |  | 2,397 |  | 2,397
Issuance of restricted and performance stock units (in shares) | 3,312 |  |  |
Exercise of stock options and employee stock purchase plan | $ 2 | 623 |  | 625
Exercise of stock options and employee stock purchase plan (in shares) | 205,712 |  |  |
Ending Balance at Sep. 30, 2019 | $ 395 | 307,839 | (172,823) | 135,411
Ending Balance (in shares) at Sep. 30, 2019 | 39,461,318 |  |  |
Beginning Balance at Dec. 31, 2019 | $ 396 | 311,618 | (179,861) | $ 132,153
Beginning Balance (in shares) at Dec. 31, 2019 | 39,589,755 |  |  | 39,589,755
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (17,776) | $ (17,776)
Stock-based compensation |  | 5,725 |  | 5,725
Issuance of restricted and performance stock units | $ 2 | (2) |  |
Issuance of restricted and performance stock units (in shares) | 168,311 |  |  |
Shares surrendered by employees to pay tax withholdings | $ (1) | (664) |  | (665)
Shares surrendered by employees to pay tax withholdings (in shares) | (38,086) |  |  |
Exercise of stock options and employee stock purchase plan | $ 4 | 2,272 |  | 2,276
Exercise of stock options and employee stock purchase plan (in shares) | 403,861 |  |  |
Ending Balance at Sep. 30, 2020 | $ 401 | 318,949 | (197,637) | $ 121,713
Ending Balance (in shares) at Sep. 30, 2020 | 40,123,841 |  |  | 40,123,841
Beginning Balance at Jun. 30, 2020 | $ 400 | 315,518 | (196,158) | $ 119,760
Beginning Balance (in shares) at Jun. 30, 2020 | 40,022,499 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (1,479) | (1,479)
Stock-based compensation |  | 2,947 |  | 2,947
Issuance of restricted and performance stock units (in shares) | 22,529 |  |  |
Shares surrendered by employees to pay tax withholdings |  | (8) |  | (8)
Shares surrendered by employees to pay tax withholdings (in shares) | (1,230) |  |  |
Exercise of stock options and employee stock purchase plan | $ 1 | 492 |  | 493
Exercise of stock options and employee stock purchase plan (in shares) | 80,043 |  |  |
Ending Balance at Sep. 30, 2020 | $ 401 | $ 318,949 | $ (197,637) | $ 121,713
Ending Balance (in shares) at Sep. 30, 2020 | 40,123,841 |  |  | 40,123,841

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