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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings
--- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 14,910 |  |
Beginning balance at Dec. 31, 2017 | $ 219,493 | $ 10,823 | $ 100,456 | $ 108,214
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | (5,296) |  |  | (5,296)
Vesting of restricted stock (in shares) |  | 133 |  |
Vesting of restricted stock | (787) | $ (79) | (708) |
Stock-based compensation expense | 676 | $ 69 | 607 |
Ending balance (in shares) at Mar. 31, 2018 |  | 15,043 |  |
Ending balance at Mar. 31, 2018 | 214,086 | $ 10,813 | 100,355 | 102,918
Beginning balance (in shares) at Dec. 31, 2017 |  | 14,910 |  |
Beginning balance at Dec. 31, 2017 | 219,493 | $ 10,823 | 100,456 | 108,214
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | (4,747) |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 15,043 |  |
Ending balance at Jun. 30, 2018 | 215,390 | $ 10,888 | 101,035 | 103,467
Beginning balance (in shares) at Mar. 31, 2018 |  | 15,043 |  |
Beginning balance at Mar. 31, 2018 | 214,086 | $ 10,813 | 100,355 | 102,918
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | 549 |  |  | 549
Stock-based compensation expense | 755 | $ 75 | 680 |
Ending balance (in shares) at Jun. 30, 2018 |  | 15,043 |  |
Ending balance at Jun. 30, 2018 | $ 215,390 | $ 10,888 | 101,035 | 103,467
Beginning balance (in shares) at Dec. 31, 2018 | 15,090 | 15,090 |  |
Beginning balance at Dec. 31, 2018 | $ 201,100 | $ 11,021 | 102,243 | 87,836
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | (3,042) |  |  | (3,042)
Vesting of restricted stock (in shares) |  | 146 |  |
Vesting of restricted stock | (714) | $ (71) | (643) |
Stock-based compensation expense | 560 | $ 56 | 504 |
Ending balance (in shares) at Mar. 31, 2019 |  | 15,236 |  |
Ending balance at Mar. 31, 2019 | $ 197,904 | $ 11,006 | 102,104 | 84,794
Beginning balance (in shares) at Dec. 31, 2018 | 15,090 | 15,090 |  |
Beginning balance at Dec. 31, 2018 | $ 201,100 | $ 11,021 | 102,243 | 87,836
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | $ (8,290) |  |  |
Ending balance (in shares) at Jun. 30, 2019 | 15,236 | 15,236 |  |
Ending balance at Jun. 30, 2019 | $ 193,442 | $ 11,085 | 102,811 | 79,546
Beginning balance (in shares) at Mar. 31, 2019 |  | 15,236 |  |
Beginning balance at Mar. 31, 2019 | 197,904 | $ 11,006 | 102,104 | 84,794
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss | (5,248) |  |  | (5,248)
Stock-based compensation expense | $ 786 | $ 79 | 707 |
Ending balance (in shares) at Jun. 30, 2019 | 15,236 | 15,236 |  |
Ending balance at Jun. 30, 2019 | $ 193,442 | $ 11,085 | $ 102,811 | $ 79,546

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