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Summary of Status of Company's Stock Option Plans and Changes (Detail) (Employee Stock Option, USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Employee Stock Option
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Balances at beginning of period, Number of Shares |
2,305,000 |
0 |
| Number of Shares Options Assumed in the Merger |
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200,000 |
| Number of Shares Options Granted |
1,573,000 |
2,105,000 |
| Number of Shares Options Exercised |
0 |
0 |
| Number of Shares Options Cancelled |
250,000 |
0 |
| Number of Shares Options Expired |
0 |
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| Balances at End of period, Number of shares |
3,628,000 |
2,305,000 |
| Number of Shares Options Vested and Exercisable |
1,029,996 |
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| Weighted Average Exercise Price Outstanding Beginning of period |
$ 3.96 |
$ 0 |
| Weighted Average Exercise Price Options Assumed in the Merger |
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$ 3.05 |
| Weighted Average Exercise Price Options Granted |
$ 3.22 |
$ 4.05 |
| Weighted Average Exercise Price Options Exercised |
$ 0 |
$ 0 |
| Weighted Average Exercise Price Options Cancelled |
$ 3.98 |
$ 0 |
| Weighted Average Exercise Price Options Expired |
$ 0 |
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| Weighted Average Exercise Price Outstanding end of period |
$ 3.64 |
$ 3.96 |
| Weighted Average Exercise Price Options Vested and Exercisable |
$ 3.81 |
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