Condensed Consolidated Statements of Equity - Unaudited - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income | Treasury Stock |
Beginning balance (in shares) at Dec. 31, 2017 | | 23,154,000 | | | | |
Beginning balance at Dec. 31, 2017 | $ 207,163 | $ 23 | $ 379,388 | $ (172,767) | $ 544 | $ (25) |
Beginning balance, treasury stock (in shares) at Dec. 31, 2017 | | | | | | 1,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | 124 | | 124 | | | |
Purchases of treasury stock (in shares) | | | | | | 442,000 |
Purchases of treasury stock | (4,985) | | | | | $ (4,985) |
Retirement of treasury stock (in shares) | | (336,000) | | | | (336,000) |
Retirement of treasury stock | 0 | | (3,776) | | | $ 3,776 |
Net income (loss) | (2,863) | | | (2,863) | | |
Reclassification of unrealized gain on investments to accumulated deficit | 17 | | | 561 | (544) | |
Ending balance (in shares) at Mar. 31, 2018 | | 22,818,000 | | | | |
Ending balance at Mar. 31, 2018 | 199,456 | $ 23 | 375,736 | (175,069) | 0 | $ (1,234) |
Ending balance, treasury stock (in shares) at Mar. 31, 2018 | | | | | | 107,000 |
Beginning balance (in shares) at Dec. 31, 2017 | | 23,154,000 | | | | |
Beginning balance at Dec. 31, 2017 | 207,163 | $ 23 | 379,388 | (172,767) | 544 | $ (25) |
Beginning balance, treasury stock (in shares) at Dec. 31, 2017 | | | | | | 1,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Net income (loss) | (3,229) | | | | | |
Ending balance (in shares) at Sep. 30, 2018 | | 21,685,000 | | | | |
Ending balance at Sep. 30, 2018 | 184,502 | $ 22 | 362,651 | (175,436) | 0 | $ (2,735) |
Ending balance, treasury stock (in shares) at Sep. 30, 2018 | | | | | | 223,000 |
Beginning balance (in shares) at Mar. 31, 2018 | | 22,818,000 | | | | |
Beginning balance at Mar. 31, 2018 | 199,456 | $ 23 | 375,736 | (175,069) | 0 | $ (1,234) |
Beginning balance, treasury stock (in shares) at Mar. 31, 2018 | | | | | | 107,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | 176 | | 176 | | | |
Exercise of restricted stock units (in shares) | | 23,000 | | | | |
Exercise of restricted stock units | 0 | | | | | |
Purchases of treasury stock (in shares) | | | | | | 713,000 |
Purchases of treasury stock | (7,960) | | | | | $ (7,960) |
Retirement of treasury stock (in shares) | | (819,000) | | | | (819,000) |
Retirement of treasury stock | 0 | $ (1) | (9,168) | | | $ 9,169 |
Net income (loss) | 4,302 | | | 4,302 | | |
Ending balance (in shares) at Jun. 30, 2018 | | 22,022,000 | | | | |
Ending balance at Jun. 30, 2018 | 195,974 | $ 22 | 366,744 | (170,767) | 0 | $ (25) |
Ending balance, treasury stock (in shares) at Jun. 30, 2018 | | | | | | 1,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | 80 | | 80 | | | |
Purchases of treasury stock (in shares) | | | | | | 561,000 |
Purchases of treasury stock | (6,908) | | | | | $ (6,908) |
Retirement of treasury stock (in shares) | | (337,000) | | | | (337,000) |
Retirement of treasury stock | (1) | $ 0 | (4,173) | | | $ 4,172 |
Distribution of treasury stock to deferred compensation plan participant (in shares) | | | | | | (2,000) |
Distribution of treasury stock to deferred compensation plan participant | 26 | | | | | $ 26 |
Net income (loss) | (4,669) | | | (4,669) | | |
Ending balance (in shares) at Sep. 30, 2018 | | 21,685,000 | | | | |
Ending balance at Sep. 30, 2018 | $ 184,502 | $ 22 | 362,651 | (175,436) | $ 0 | $ (2,735) |
Ending balance, treasury stock (in shares) at Sep. 30, 2018 | | | | | | 223,000 |
Beginning balance (in shares) at Dec. 31, 2018 | 20,848,000 | 20,848,000 | | | | |
Beginning balance at Dec. 31, 2018 | $ 176,624 | $ 21 | 353,250 | (175,536) | | $ (1,111) |
Beginning balance, treasury stock (in shares) at Dec. 31, 2018 | 121,000 | | | | | 121,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | $ 22 | | 22 | | | |
Purchases of treasury stock (in shares) | | | | | | 420,000 |
Purchases of treasury stock | (4,340) | | | | | $ (4,340) |
Retirement of treasury stock (in shares) | | (529,000) | | | | (529,000) |
Retirement of treasury stock | 0 | $ (1) | (5,328) | | | $ 5,329 |
Net income (loss) | 6,684 | | | 6,684 | | |
Ending balance (in shares) at Mar. 31, 2019 | | 20,319,000 | | | | |
Ending balance at Mar. 31, 2019 | $ 178,990 | $ 20 | 347,944 | (168,852) | | $ (122) |
Ending balance, treasury stock (in shares) at Mar. 31, 2019 | | | | | | 12,000 |
Beginning balance (in shares) at Dec. 31, 2018 | 20,848,000 | 20,848,000 | | | | |
Beginning balance at Dec. 31, 2018 | $ 176,624 | $ 21 | 353,250 | (175,536) | | $ (1,111) |
Beginning balance, treasury stock (in shares) at Dec. 31, 2018 | 121,000 | | | | | 121,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Net income (loss) | $ 6,945 | | | | | |
Ending balance (in shares) at Sep. 30, 2019 | 19,968,000 | 19,968,000 | | | | |
Ending balance at Sep. 30, 2019 | $ 175,552 | $ 20 | 344,193 | (168,591) | | $ (70) |
Ending balance, treasury stock (in shares) at Sep. 30, 2019 | 7,000 | | | | | 7,000 |
Beginning balance (in shares) at Mar. 31, 2019 | | 20,319,000 | | | | |
Beginning balance at Mar. 31, 2019 | $ 178,990 | $ 20 | 347,944 | (168,852) | | $ (122) |
Beginning balance, treasury stock (in shares) at Mar. 31, 2019 | | | | | | 12,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | 22 | | 22 | | | |
Exercise of restricted stock units | (5) | | (5) | | | |
Purchases of treasury stock (in shares) | | | | | | 245,000 |
Purchases of treasury stock | (2,704) | | | | | $ (2,704) |
Retirement of treasury stock (in shares) | | (252,000) | | | | (252,000) |
Retirement of treasury stock | 0 | | (2,771) | | | $ 2,771 |
Net income (loss) | (1,118) | | | (1,118) | | |
Ending balance (in shares) at Jun. 30, 2019 | | 20,067,000 | | | | |
Ending balance at Jun. 30, 2019 | 175,185 | $ 20 | 345,190 | (169,970) | | $ (55) |
Ending balance, treasury stock (in shares) at Jun. 30, 2019 | | | | | | 5,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Stock-based compensation expense | 22 | | 22 | | | |
Purchases of treasury stock (in shares) | | | | | | 101,000 |
Purchases of treasury stock | (1,034) | | | | | $ (1,034) |
Retirement of treasury stock (in shares) | | (99,000) | | | | (99,000) |
Retirement of treasury stock | 0 | | (1,019) | | | $ 1,019 |
Net income (loss) | $ 1,379 | | | 1,379 | | |
Ending balance (in shares) at Sep. 30, 2019 | 19,968,000 | 19,968,000 | | | | |
Ending balance at Sep. 30, 2019 | $ 175,552 | $ 20 | $ 344,193 | $ (168,591) | | $ (70) |
Ending balance, treasury stock (in shares) at Sep. 30, 2019 | 7,000 | | | | | 7,000 |