Concentration of Credit Risk - Additional Information (Detail) |
6 Months Ended |
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Jun. 30, 2015
Instruments
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| STA Instruments [Member] | |
| Concentration Risk [Line Items] | |
| Number of instrument on purchase agreement | 12,000 |
| X | ||||||||||
- Definition Number of instrument on purchase agreement. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Details
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