Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Revenues | |||||||||||
| Revenues | $ 44,445 | $ 42,469 | $ 39,877 | $ 37,493 | $ 36,573 | $ 34,348 | $ 32,302 | $ 30,356 | $ 164,284 | $ 133,579 | $ 107,962 |
| Cost of revenues | 9,002 | 8,762 | 8,157 | 7,964 | 7,521 | 7,421 | 7,175 | 6,846 | 33,885 | 28,963 | 24,660 |
| Gross profit | 35,443 | 33,707 | 31,720 | 29,529 | 29,052 | 26,927 | 25,127 | 23,510 | 130,399 | 104,616 | 83,302 |
| Operating expenses: | |||||||||||
| Research and development | 7,532 | 7,564 | 7,205 | 7,150 | 7,015 | 6,490 | 6,411 | 6,404 | 29,451 | 26,320 | 21,678 |
| Sales and marketing | 13,068 | 12,282 | 12,776 | 11,443 | 11,938 | 11,774 | 11,845 | 12,492 | 49,569 | 48,049 | 42,523 |
| General and administrative | 7,147 | 6,983 | 6,427 | 6,016 | 5,888 | 5,156 | 5,081 | 4,875 | 26,573 | 21,000 | 16,792 |
| Total operating expenses | 27,747 | 26,829 | 26,408 | 24,609 | 24,841 | 23,420 | 23,337 | 23,771 | 105,593 | 95,369 | 80,993 |
| Income from operations | 7,696 | 6,878 | 5,312 | 4,920 | 4,211 | 3,507 | 1,790 | (261) | 24,806 | 9,247 | 2,309 |
| Other income (expense), net | (183) | (154) | 128 | (77) | (568) | (119) | 41 | 12 | (286) | (634) | (268) |
| Income before income taxes | 7,513 | 6,724 | 5,440 | 4,843 | 3,643 | 3,388 | 1,831 | (249) | 24,520 | 8,613 | 2,041 |
| Provision for (benefit from) income taxes | 2,089 | 2,601 | 2,124 | 1,841 | (22,270) | 283 | 174 | 182 | 8,655 | (21,631) | 500 |
| Net income | $ 5,424 | $ 4,123 | $ 3,316 | $ 3,002 | $ 25,913 | $ 3,105 | $ 1,657 | $ (431) | $ 15,865 | $ 30,244 | $ 1,541 |
| Earnings Per Share [Abstract] | |||||||||||
| Basic (in usd per share) | $ 0.16 | $ 0.12 | $ 0.10 | $ 0.09 | $ 0.77 | $ 0.09 | $ 0.05 | $ (0.01) | $ 0.47 | $ 0.92 | $ 0.05 |
| Diluted (usd per share) | $ 0.14 | $ 0.11 | $ 0.09 | $ 0.08 | $ 0.69 | $ 0.08 | $ 0.04 | $ (0.01) | $ 0.42 | $ 0.81 | $ 0.04 |
| Federal and State Jurisdictions [Member] | |||||||||||
| Operating expenses: | |||||||||||
| Provision for (benefit from) income taxes | $ (23,700) | ||||||||||
| X | ||||||||||
- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
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- References No definition available.
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The aggregate total amount of expenses directly related to the marketing or selling of products or services. No definition available.
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- Details
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