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v2.4.1.9

Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2015 | Jun. 12, 2014
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare
Net proceeds from public offering | $ 18,488 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 61,425 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 14,226 us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Underwriting discounts and other issuance costs | 470 us-gaap_PaymentsOfStockIssuanceCosts | 2,733 us-gaap_PaymentsOfStockIssuanceCosts | 550 us-gaap_PaymentsOfStockIssuanceCosts |  |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares issued |  |  |  | 14,636,363 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Common stock, par value |  |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Public offering, price per share |  |  |  | $ 5.50 us-gaap_SharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Net proceeds from public offering |  |  |  | 75,700 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Underwriting discounts and other issuance costs |  |  |  | $ 5,100 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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