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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Summary of Reconciliation of Changes in Stockholders' Equity |
Reconciliation of the changes in stockholders' equity for the three and nine months ended September 30, 2019 and 2018 |
|  | Common Stock |  |  | Additional Paid-in |  |  | Accumulated Other Comprehensive |  |  | Accumulated |  |  |  |  |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Loss |  |  | Deficit |  |  | Total |
Balance at December 31, 2018 |  |  | 61,276 |  |  | $ | — |  |  | $ | 401,273 |  |  | $ | (18,706 | ) |  | $ | (99,189 | ) |  | $ | 283,378 |
Common stock issued upon exercise of options |  |  | 4 |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | 22 |
Vesting of restricted stock and performance stock units |  |  | 664 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (277 | ) |  |  | — |  |  |  | (3,595 | ) |  |  | — |  |  |  | — |  |  |  | (3,595 | )
Compensation cost for restricted stock |  |  | — |  |  |  | — |  |  |  | 653 |  |  |  | — |  |  |  | — |  |  |  | 653 |
Compensation cost for stock option grants |  |  | — |  |  |  | — |  |  |  | 324 |  |  |  | — |  |  |  | — |  |  |  | 324 |
Compensation cost for performance stock units |  |  | — |  |  |  | — |  |  |  | 254 |  |  |  | — |  |  |  | — |  |  |  | 254 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,258 | ) |  |  | (3,258 | )
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,232 |  |  |  |  |  |  |  | 2,232 |
Unrealized gain on marketable securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 497 |  |  |  | — |  |  |  | 497 |
Balance at March 31, 2019 |  |  | 61,667 |  |  | $ | — |  |  | $ | 398,931 |  |  | $ | (15,977 | ) |  | $ | (102,447 | ) |  | $ | 280,507 |
Common stock issued upon exercise of options |  |  | 18 |  |  |  | — |  |  |  | 147 |  |  |  | — |  |  |  | — |  |  |  | 147 |
Vesting of restricted stock and performance stock units |  |  | 51 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (11 | ) |  |  | — |  |  |  | (109 | ) |  |  | — |  |  |  | — |  |  |  | (109 | )
Compensation cost for restricted stock |  |  | — |  |  |  | — |  |  |  | 874 |  |  |  | — |  |  |  | — |  |  |  | 874 |
Compensation cost for stock option grants |  |  | — |  |  |  | — |  |  |  | 311 |  |  |  | — |  |  |  | — |  |  |  | 311 |
Compensation cost for performance stock units |  |  | — |  |  |  | — |  |  |  | (569 | ) |  |  | — |  |  |  | — |  |  |  | (569 | )
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,398 |  |  |  | 4,398 |
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,476 |  |  |  |  |  |  |  | 2,476 |
Unrealized gain on marketable securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 186 |  |  |  | — |  |  |  | 186 |
Balance at June 30, 2019 |  |  | 61,725 |  |  | $ | — |  |  | $ | 399,585 |  |  | $ | (13,315 | ) |  | $ | (98,049 | ) |  | $ | 288,221 |
Common stock issued upon exercise of options |  |  | - |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | - |
Vesting of restricted stock and performance stock units |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (1 | ) |  |  | — |  |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | (7 | )
Compensation cost for restricted stock |  |  | - |  |  |  | — |  |  |  | 858 |  |  |  | — |  |  |  | — |  |  |  | 858 |
Compensation cost for stock option grants |  |  | - |  |  |  | — |  |  |  | 259 |  |  |  | — |  |  |  | — |  |  |  | 259 |
Compensation cost for performance stock units |  |  | - |  |  |  | — |  |  |  | 319 |  |  |  | — |  |  |  | — |  |  |  | 319 |
Net income |  |  | - |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13,078 |  |  |  | 13,078 |
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,557 | ) |  |  |  |  |  |  | (1,557 | )
Unrealized gain on marketable securities |  |  | - |  |  |  | — |  |  |  | — |  |  |  | 194 |  |  |  | — |  |  |  | 194 |
Balance at September 30, 2019 |  |  | 61,726 |  |  | $ | — |  |  | $ | 401,014 |  |  | $ | (14,678 | ) |  | $ | (84,971 | ) |  | $ | 301,365 |
|  | Common Stock |  |  | Additional Paid-in |  |  | Accumulated Other Comprehensive |  |  | Accumulated |  |  |  |  |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Loss |  |  | Deficit |  |  | Total |
Balance at December 31, 2017 |  |  | 60,662 |  |  | $ | — |  |  | $ | 387,931 |  |  | $ | (10,340 | ) |  | $ | (119,510 | ) |  | $ | 258,081 |
Adoption of ASU 2014-9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (75 | ) |  |  | (75 | )
Common stock issued upon exercise of options |  |  | 133 |  |  |  | — |  |  |  | 974 |  |  |  | — |  |  |  | — |  |  |  | 974 |
Vesting of restricted stock and performance stock units |  |  | 407 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (149 | ) |  |  | — |  |  |  | (2,959 | ) |  |  | — |  |  |  | — |  |  |  | (2,959 | )
Compensation cost for restricted stock |  |  | — |  |  |  | — |  |  |  | 3,626 |  |  |  | — |  |  |  | — |  |  |  | 3,626 |
Compensation cost for stock option grants |  |  | — |  |  |  | — |  |  |  | 900 |  |  |  | — |  |  |  | — |  |  |  | 900 |
Compensation cost for performance stock units |  |  | — |  |  |  | — |  |  |  | 2,957 |  |  |  | — |  |  |  | — |  |  |  | 2,957 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,119 | ) |  |  | (2,119 | )
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,154 | ) |  |  |  |  |  |  | (2,154 | )
Unrealized loss on marketable securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (512 | ) |  |  | — |  |  |  | (512 | )
Balance at March 31, 2018 |  |  | 61,053 |  |  | $ | — |  |  | $ | 393,429 |  |  | $ | (13,006 | ) |  | $ | (121,704 | ) |  | $ | 258,719 |
Common stock issued upon exercise of options |  |  | 29 |  |  |  | — |  |  |  | 222 |  |  |  | — |  |  |  | — |  |  |  | 222 |
Vesting of restricted stock and performance stock units |  |  | 106 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (14 | ) |  |  | — |  |  |  | (212 | ) |  |  | — |  |  |  | — |  |  |  | (212 | )
Compensation cost for restricted stock |  |  | — |  |  |  | — |  |  |  | 1,419 |  |  |  | — |  |  |  | — |  |  |  | 1,419 |
Compensation cost for stock option grants |  |  | — |  |  |  | — |  |  |  | 475 |  |  |  | — |  |  |  | — |  |  |  | 475 |
Compensation cost for performance stock units |  |  | — |  |  |  | — |  |  |  | 1,885 |  |  |  | — |  |  |  | — |  |  |  | 1,885 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,121 |  |  |  | 4,121 |
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,652 | ) |  |  |  |  |  |  | (1,652 | )
Unrealized gain on marketable securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 194 |  |  |  | — |  |  |  | 194 |
Balance at June 30, 2018 |  |  | 61,174 |  |  | $ | — |  |  | $ | 397,218 |  |  | $ | (14,464 | ) |  | $ | (117,583 | ) |  | $ | 265,171 |
Common stock issued upon exercise of options |  |  | 62 |  |  |  | — |  |  |  | 483 |  |  |  | — |  |  |  | — |  |  |  | 483 |
Vesting of restricted stock and performance stock units |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase and retirement of common shares |  |  | (1 | ) |  |  | — |  |  |  | (9 | ) |  |  | — |  |  |  | — |  |  |  | (9 | )
Compensation cost for restricted stock |  |  | — |  |  |  | — |  |  |  | 589 |  |  |  | — |  |  |  | — |  |  |  | 589 |
Compensation cost for stock option grants |  |  | — |  |  |  | — |  |  |  | 359 |  |  |  | — |  |  |  | — |  |  |  | 359 |
Compensation cost for performance stock units |  |  | — |  |  |  | — |  |  |  | 316 |  |  |  | — |  |  |  | — |  |  |  | 316 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,096 |  |  |  | 8,096 |
Currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,783 |  |  |  |  |  |  |  | 1,783 |
Unrealized loss on marketable securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (34 | ) |  |  | — |  |  |  | (34 | )
Balance at September 30, 2018 |  |  | 61,237 |  |  | $ | — |  |  | $ | 398,956 |  |  | $ | (12,715 | ) |  | $ | (109,487 | ) |  | $ | 276,754 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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