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Stock-based Compensation - Allocation of Stock-based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
|
Sep. 30, 2014
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Sep. 30, 2013
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| Schedule of total stock-based compensation expense | ||||
| Total stock-based compensation expense | $ 1,226 | $ 683 | $ 2,754 | $ 1,862 |
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Research and development [Member]
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| Schedule of total stock-based compensation expense | ||||
| Total stock-based compensation expense | 691 | 318 | 1,392 | 860 |
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Sales and marketing [Member]
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| Schedule of total stock-based compensation expense | ||||
| Total stock-based compensation expense | 129 | 97 | 361 | 249 |
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General and administrative [Member]
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| Schedule of total stock-based compensation expense | ||||
| Total stock-based compensation expense | $ 406 | $ 268 | $ 1,001 | $ 753 |