Joint Venture Agreement (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Oct. 31, 2013 |
Jun. 30, 2016 |
Sep. 30, 2014 |
Dec. 31, 2013 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Oct. 28, 2013 |
Apr. 10, 2013 |
| Schedule of Equity Method Investments [Line Items] |
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| Capital contribution in exchange of membership interests |
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$ 0
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$ 1,000,000
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$ 1,000,000
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| Common stock, shares issued (in shares) |
10,000
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13,652,000
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9,821,000
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3,286,700
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690,000
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| Additional expense related to shares issued |
$ 175,000
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$ 231,000
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| Joint Venture Agreement |
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| Schedule of Equity Method Investments [Line Items] |
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| Percentage of outstanding membership interests in joint venture |
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50.00%
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| Capital contribution in exchange of membership interests |
$ 1,000,000
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$ 1,000,000
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| Fair value of capital contribution in joint venture |
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$ 6,000,000
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| Joint Venture Agreement | Forecast |
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| Schedule of Equity Method Investments [Line Items] |
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| Capital contribution in exchange of membership interests |
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$ 1,000,000
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| Joint Venture Agreement | Maximum |
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| Schedule of Equity Method Investments [Line Items] |
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| Capital contribution in exchange of membership interests |
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$ 4,000,000.0
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