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Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Beginning Balance | $ 173,409 | $ 149,686 | $ 158,088 | $ 151,600
Issuance of common stock under stock plans, net | (420) | (793) | 638 | 3,357
Stock-based compensation expense | 2,697 | 3,072 | $ 7,964 | 8,605
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member |
Net income (loss) | (3,760) | (2,699) | $ 7,564 | (14,460)
Other comprehensive income (loss) | 2,782 | (1,614) | 611 | (1,450)
Ending Balance | 174,708 | 147,652 | 174,708 | 147,652
Cumulative Effect Adjustment [Member] |  |  |  |
Beginning Balance |  |  | (157) |
Common Stock [Member] |  |  |  |
Beginning Balance | $ 234 | $ 231 | $ 233 | $ 230
Beginning Balance, Shares | 23,401,000 | 23,089,000 | 23,275,000 | 22,951,000
Issuance of common stock under stock plans, net | $ 2 | $ 1 | $ 3 | $ 2
Issuance of common stock under stock plans, net, Shares | 178,000 | 158,000 | 304,000 | 296,000
Ending Balance | $ 236 | $ 232 | $ 236 | $ 232
Ending Balance, Shares | 23,579,000 | 23,247,000 | 23,579,000 | 23,247,000
Additional Paid-in Capital [Member] |  |  |  |
Beginning Balance | $ 222,778 | $ 210,378 | $ 216,454 | $ 200,696
Issuance of common stock under stock plans, net | (422) | (794) | 635 | 3,355
Stock-based compensation expense | 2,697 | 3,072 | 7,964 | 8,605
Ending Balance | 225,053 | 212,656 | 225,053 | 212,656
Retained Earnings [Member] |  |  |  |
Beginning Balance | 129,314 | 115,956 | 118,147 | 127,717
Net income (loss) | (3,760) | (2,699) | 7,564 | (14,460)
Ending Balance | 125,554 | 113,257 | 125,554 | 113,257
Retained Earnings [Member] | Cumulative Effect Adjustment [Member] |  |  |  |
Beginning Balance |  |  | (157) |
Treasury Stock [Member] |  |  |  |
Beginning Balance | $ (171,889) | $ (171,889) | $ (171,889) | $ (171,889)
Beginning Balance, Shares | 4,631,000 | 4,631,000 | 4,631,000 | 4,631,000
Ending Balance | $ (171,889) | $ (171,889) | $ (171,889) | $ (171,889)
Ending Balance, Shares | 4,631,000 | 4,631,000 | 4,631,000 | 4,631,000
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Beginning Balance | $ (7,028) | $ (4,990) | $ (4,857) | $ (5,154)
Other comprehensive income (loss) | 2,782 | (1,614) | 611 | (1,450)
Ending Balance | $ (4,246) | $ (6,604) | $ (4,246) | $ (6,604)

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