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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | ---
Balances at Dec. 31, 2017 | $ 319,913 | $ 264 | $ 399,510 | $ (79,861)
Balances (in shares) at Dec. 31, 2017 |  | 26,413,000 |  |
Proceeds from issuance of stock on options exercised | 1,273 | $ 6 | 1,267 |
Proceeds from issuance of stock on options exercised (in shares) |  | 564,000 |  |
Share-based compensation | 7,063 |  | 7,063 |
Issuance of common stock, net of offering costs | 25,608 | $ 10 | 25,598 |
Issuance of common stock, net of offering costs (in shares) |  | 975,000 |  |
Tax benefit from share-based compensation | (820) |  | (820) |
Net income (loss) | 4,400 |  |  | 4,400
Balances at Sep. 30, 2018 | 357,437 | $ 280 | 432,618 | (75,461)
Balances (in shares) at Sep. 30, 2018 |  | 27,952,000 |  |
Balances at Jun. 30, 2018 | 356,787 | $ 274 | 428,850 | (72,337)
Balances (in shares) at Jun. 30, 2018 |  | 27,430,000 |  |
Proceeds from issuance of stock on options exercised | 856 | $ 6 | 850 |
Proceeds from issuance of stock on options exercised (in shares) |  | 522,000 |  |
Share-based compensation | 2,501 |  | 2,501 |
Tax benefit from share-based compensation | 417 |  | 417 |
Net income (loss) | (3,124) |  |  | (3,124)
Balances at Sep. 30, 2018 | 357,437 | $ 280 | 432,618 | (75,461)
Balances (in shares) at Sep. 30, 2018 |  | 27,952,000 |  |
Balances at Dec. 31, 2018 | 315,152 | $ 268 | 435,245 | (120,361)
Balances (in shares) at Dec. 31, 2018 |  | 26,779,000 |  |
Cumulative effect of change in accounting for leases, net of tax (ASU 842 [Member]) at Dec. 31, 2018 | (12,272) |  |  | (12,272)
Issuance of common stock related to business combination | 16,608 | $ 9 | 16,599 |
Issuance of common stock related to business combination (In Shares) |  | 911,000 |  |
Proceeds from issuance of stock on options exercised | $ 56 | $ 1 | 55 |
Proceeds from issuance of stock on options exercised (in shares) | 90,890 | 123,000 |  |
Share-based compensation | $ 8,840 |  | 8,840 |
Tax benefit from share-based compensation | (300) |  | (300) |
Net income (loss) | (31,873) |  |  | (31,873)
Balances at Sep. 30, 2019 | 296,211 | $ 278 | 460,439 | (164,506)
Balances (in shares) at Sep. 30, 2019 |  | 27,813,000 |  |
Balances at Jun. 30, 2019 | 303,089 | $ 278 | 457,870 | (155,059)
Balances (in shares) at Jun. 30, 2019 |  | 27,800,000 |  |
Proceeds from issuance of stock on options exercised (in shares) |  | 13,000 |  |
Share-based compensation | 2,578 |  | 2,578 |
Tax benefit from share-based compensation | (9) |  | (9) |
Net income (loss) | (9,447) |  |  | (9,447)
Balances at Sep. 30, 2019 | $ 296,211 | $ 278 | $ 460,439 | $ (164,506)
Balances (in shares) at Sep. 30, 2019 |  | 27,813,000 |  |

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