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Shares of Class A Common Stock for Future Issuance (Detail)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Schedule Of Stockholders Equity [Line Items] | ||
| Stock options under the our incentive plans | 2,295,210 | 1,825,320 |
| Warrants outstanding | 6,670,103 | |
| Total shares reserved for future issuance | 8,965,313 | |
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Stock Options
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||
| Schedule Of Stockholders Equity [Line Items] | ||
| Stock options under the our incentive plans | 1,995,210 | |
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Equity Compensation Plans Not Approved by Security Holders
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| Schedule Of Stockholders Equity [Line Items] | ||
| Total shares reserved for future issuance | 300,000 |