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Stock-Based Compensation - Narrative (Details) (USD $)
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12 Months Ended |
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12 Months Ended |
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12 Months Ended |
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Dec. 31, 2013
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Oct. 26, 2011
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Dec. 31, 2013
Stock options
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Dec. 31, 2012
Stock options
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Dec. 31, 2013
RSUs
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Dec. 31, 2012
RSUs
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Dec. 31, 2013
Less than 10%
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Dec. 31, 2013
More than 10%
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Dec. 31, 2013
Annual vesting period
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| Stock-based compensation |
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| Number of shares reserved for issuance |
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4,225,648 |
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| Provision for number of additional shares authorized, maximum shares |
2,535,389 |
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| Provision for number of additional shares authorized, percent |
4.50% |
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| Additional shares issued |
1,982,113 |
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| Voting power maximum percent |
10.00% |
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| Exercise price fair market value percentage |
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100.00% |
110.00% |
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| Voting power minimum percent |
10.00% |
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| Vesting rights percentage |
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25.00% |
| Maximum term from date of grant |
10 years |
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5 years |
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| Weighted average grant date fair value (in usd per share) |
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$ 4.16 |
$ 4.50 |
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| Vesting period |
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4 years |
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| Aggregate intrinsic value |
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$ 4,200,000 |
$ 2,300,000 |
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| Unrecognized compensation |
7,298,000 |
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| Unrecognized compensation weighted average period |
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2 years 8 months 12 days |
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2 years 10 months 24 days |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |
$ 500,000 |
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