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Stockholders' Equity - Summary of Reconciliation of Changes in Stockholders' Equity (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Beginning Balance | $ 288,221 | $ 280,507 | $ 283,378 | $ 265,171 | $ 258,719 | $ 258,081 | $ 283,378 | $ 258,081
Adoption of ASU 2014-9 |  |  |  |  |  | (75) |  |
Common stock issued upon exercise of options |  | 147 | 22 | 483 | 222 | 974 |  |
Purchase and retirement of common shares | (7) | (109) | (3,595) | (9) | (212) | (2,959) |  |
Compensation cost for restricted stock | 858 | 874 | 653 | 589 | 1,419 | 3,626 |  |
Compensation cost for stock option grants | 259 | 311 | 324 | 359 | 475 | 900 |  |
Compensation cost for performance stock units | 319 | (569) | 254 | 316 | 1,885 | 2,957 |  |
Net income (loss) | 13,078 | 4,398 | (3,258) | 8,096 | 4,121 | (2,119) | 14,218 | 10,098
Currency translation adjustments | (1,557) | 2,476 | 2,232 | 1,783 | (1,652) | (2,154) | 3,151 | (2,023)
Unrealized gain (loss) on marketable securities | 194 | 186 | 497 | (34) | 194 | (512) | 877 | (352)
Ending Balance | $ 301,365 | $ 288,221 | $ 280,507 | $ 276,754 | $ 265,171 | $ 258,719 | $ 301,365 | $ 276,754
Common Stock [Member] |  |  |  |  |  |  |  |
Beginning Balance, Shares | 61,725 | 61,667 | 61,276 | 61,174 | 61,053 | 60,662 | 61,276 | 60,662
Common stock issued upon exercise of options, Shares |  | 18 | 4 | 62 | 29 | 133 |  |
Vesting of restricted stock and performance stock units, Shares | 2 | 51 | 664 | 2 | 106 | 407 |  |
Purchase and retirement of common shares, Shares | (1) | (11) | (277) | (1) | (14) | (149) |  |
Ending Balance, Shares | 61,726 | 61,725 | 61,667 | 61,237 | 61,174 | 61,053 | 61,726 | 61,237
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Beginning Balance | $ 399,585 | $ 398,931 | $ 401,273 | $ 397,218 | $ 393,429 | $ 387,931 | $ 401,273 | $ 387,931
Common stock issued upon exercise of options |  | 147 | 22 | 483 | 222 | 974 |  |
Purchase and retirement of common shares | (7) | (109) | (3,595) | (9) | (212) | (2,959) |  |
Compensation cost for restricted stock | 858 | 874 | 653 | 589 | 1,419 | 3,626 |  |
Compensation cost for stock option grants | 259 | 311 | 324 | 359 | 475 | 900 |  |
Compensation cost for performance stock units | 319 | (569) | 254 | 316 | 1,885 | 2,957 |  |
Ending Balance | 401,014 | 399,585 | 398,931 | 398,956 | 397,218 | 393,429 | 401,014 | 398,956
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |
Beginning Balance | (13,315) | (15,977) | (18,706) | (14,464) | (13,006) | (10,340) | (18,706) | (10,340)
Currency translation adjustments | (1,557) | 2,476 | 2,232 | 1,783 | (1,652) | (2,154) |  |
Unrealized gain (loss) on marketable securities | 194 | 186 | 497 | (34) | 194 | (512) |  |
Ending Balance | (14,678) | (13,315) | (15,977) | (12,715) | (14,464) | (13,006) | (14,678) | (12,715)
Accumulated Deficit [Member] |  |  |  |  |  |  |  |
Beginning Balance | (98,049) | (102,447) | (99,189) | (117,583) | (121,704) | (119,510) | (99,189) | (119,510)
Adoption of ASU 2014-9 |  |  |  |  |  | (75) |  |
Net income (loss) | 13,078 | 4,398 | (3,258) | 8,096 | 4,121 | (2,119) |  |
Ending Balance | $ (84,971) | $ (98,049) | $ (102,447) | $ (109,487) | $ (117,583) | $ (121,704) | $ (84,971) | $ (109,487)

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