The Company and Summary of Significant Accounting Policies - Additional Information (Detail)
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Jun. 30, 2012
Customer
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Dec. 31, 2011
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Summary Of Significant Accounting Policies [Line Items] | ||
Number of customers with significant accounts receivable | 5 | |
Percentage of gross accounts receivable | 71.00% | |
Express Scripts
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Summary Of Significant Accounting Policies [Line Items] | ||
Number of customers with significant accounts receivable | 1 | |
Percentage of gross accounts receivable | 46.00% | 79.00% |