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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional 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 |  |  | (16,526) | (16,526)
Issuance of restricted and performance stock units (in shares) | 38,028 |  |  |
Stock-based compensation |  | 4,989 |  | 4,989
Exercise of stock options and employee stock purchase plan | $ 4 | 2,511 |  | 2,515
Exercise of stock options and employee stock purchase plan (in shares) | 313,391 |  |  |
Ending Balance at Jun. 30, 2019 | $ 393 | 304,819 | (167,252) | 137,960
Ending Balance (in shares) at Jun. 30, 2019 | 39,252,294 |  |  |
Beginning Balance at Mar. 31, 2019 | $ 391 | 300,582 | (160,229) | 140,744
Beginning Balance (in shares) at Mar. 31, 2019 | 39,128,843 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (7,023) | (7,023)
Stock-based compensation |  | 2,674 |  | 2,674
Exercise of stock options and employee stock purchase plan | $ 2 | 1,563 |  | 1,565
Exercise of stock options and employee stock purchase plan (in shares) | 123,451 |  |  |
Ending Balance at Jun. 30, 2019 | $ 393 | 304,819 | (167,252) | 137,960
Ending Balance (in shares) at Jun. 30, 2019 | 39,252,294 |  |  |
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 |  |  | (16,297) | $ (16,297)
Issuance of restricted and performance stock units | $ 1 | (1) |  |
Issuance of restricted and performance stock units (in shares) | 145,943 |  |  |
Stock-based compensation |  | 2,778 |  | 2,778
Shares surrendered by employees to pay tax withholdings | $ (1) | (657) |  | (658)
Shares surrendered by employees to pay tax withholdings (in shares) | (38,736) |  |  |
Exercise of stock options and employee stock purchase plan | $ 4 | 1,780 |  | 1,784
Exercise of stock options and employee stock purchase plan (in shares) | 323,818 |  |  |
Ending Balance at Jun. 30, 2020 | $ 400 | 315,518 | (196,158) | $ 119,760
Ending Balance (in shares) at Jun. 30, 2020 | 40,020,780 |  |  | 40,020,780
Beginning Balance at Mar. 31, 2020 | $ 397 | 311,850 | (188,053) | $ 124,194
Beginning Balance (in shares) at Mar. 31, 2020 | 39,738,767 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (8,105) | (8,105)
Issuance of restricted and performance stock units (in shares) | 10,021 |  |  |
Stock-based compensation |  | 2,222 |  | 2,222
Shares surrendered by employees to pay tax withholdings |  | (17) |  | (17)
Shares surrendered by employees to pay tax withholdings (in shares) | (1,766) |  |  |
Exercise of stock options and employee stock purchase plan | $ 3 | 1,463 |  | 1,466
Exercise of stock options and employee stock purchase plan (in shares) | 273,758 |  |  |
Ending Balance at Jun. 30, 2020 | $ 400 | $ 315,518 | $ (196,158) | $ 119,760
Ending Balance (in shares) at Jun. 30, 2020 | 40,020,780 |  |  | 40,020,780

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