Stock-Based Compensation - Employee Stock Purchase Plan (Details)
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1 Months Ended |
6 Months Ended |
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Mar. 05, 2015
$ / shares
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Jan. 31, 2015
USD ($)
offering_period
shares
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Jun. 30, 2015
USD ($)
shares
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Dec. 31, 2014
shares
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| Stock-Based compensation |
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| Total shares reserved |
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6,570,241
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18,423,941
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| 2015 Employee Stock Purchase Plan |
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| Stock-Based compensation |
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| Maximum percentage of eligible compensation per employee to purchase shares of common stock |
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15.00%
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| Maximum number of shares per offering period per employee |
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1,500
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| Maximum share value per calendar year per employee | $ |
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$ 25,000
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| Employee purchase price, percentage of fair market value of common stock |
85.00%
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85.00%
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| Fair market value of common stock at beginning of offering period (in usd per share) | $ / shares |
$ 11.50
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| Accumulated employee withholdings | $ |
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$ 600,000
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| Number of employment hours requirement per week during requisite service period |
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20 hours
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| Offering period, maximum |
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27 months
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| Number of offering periods under terms of plan | offering_period |
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2
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| Offering periods beginning on May 1 and November 1 |
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6 months
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| Total shares reserved |
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375,000
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375,000
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| Number of shares option, minimum annual increase in number of shares reserved for issuance |
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250,000
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| Percentage of common stock outstanding option, minimum annual increase in number of shares reserved for issuance (as a percent) |
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1.00%
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| Unrecognized compensation cost related to nonvested share-based compensation arrangements | $ |
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$ 300,000
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| Expected weighted-average period for recognition of unrecognized stock-based compensation costs (in years) |
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3 months 18 days
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| 2015 Employee Stock Purchase Plan | Minimum |
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| Stock-Based compensation |
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| Requisite service period for award eligibility per year |
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5 months
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