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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014
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Assets |
Total assets | $ 54,258
Stock warrants [Member] |
Liabilities |
Liabilities | 3,975
Cash [Member] |
Assets |
Total assets | 17,934
Money market securities [Member] |
Assets |
Total assets | 31,016
Restricted cash [Member] |
Assets |
Total assets | 251
Corporate bonds and commercial paper [Member] |
Assets |
Total assets | 5,057
Level 1 [Member] |
Assets |
Total assets | 49,201
Level 1 [Member] | Cash [Member] |
Assets |
Total assets | 17,934
Level 1 [Member] | Money market securities [Member] |
Assets |
Total assets | 31,016
Level 1 [Member] | Restricted cash [Member] |
Assets |
Total assets | 251
Level 2 [Member] |
Assets |
Total assets | 5,057
Level 2 [Member] | Corporate bonds and commercial paper [Member] |
Assets |
Total assets | 5,057
Level 3 [Member] | Stock warrants [Member] |
Liabilities |
Liabilities | $ 3,975

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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