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Subsequent Events - Selected Balance Sheet Data (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |
Cash and cash equivalents | $ 650 | $ 1,402 | $ 782 | $ 2,385
Total assets | 12,978 | 12,387 |  |
Current portion of long-term debt | 15,000 | 15,000 |  |
Derivative liability | 9,998 | 12,237 |  |
Total liabilities | 33,403 | 33,339 |  |
Total stockholders' (deficit) equity | (109,215) | (108,109) |  |
Total liabilities, redeemable convertible preferred stock, and stockholders' deficit | 12,978 | 12,387 |  |
Series A Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 250 | 250 |  |
Series B Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 4,215 | 4,215 |  |
Series C Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 28,121 | 28,121 |  |
Series C-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 13,500 | 13,500 |  |
Series D-1 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 16,952 | 16,952 |  |
Series D-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 25,752 | 24,119 |  |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash and cash equivalents | 650 |  |  |
Total assets | 12,978 |  |  |
Current portion of long-term debt | 15,000 |  |  |
Derivative liability | 9,998 |  |  |
Total liabilities | 33,403 |  |  |
Total stockholders' (deficit) equity | (109,215) |  |  |
Total liabilities, redeemable convertible preferred stock, and stockholders' deficit | 12,978 |  |  |
Subsequent Event [Member] | Series A Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 250 |  |  |
Subsequent Event [Member] | Series B Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 4,215 |  |  |
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 28,121 |  |  |
Subsequent Event [Member] | Series C-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 13,500 |  |  |
Subsequent Event [Member] | Series D-1 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 16,952 |  |  |
Subsequent Event [Member] | Series D-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 25,752 |  |  |
Pro Forma [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash and cash equivalents | 42,435 |  |  |
Total assets | 49,510 |  |  |
Current portion of long-term debt | 0 |  |  |
Derivative liability | 0 |  |  |
Total liabilities | 6,690 |  |  |
Total stockholders' (deficit) equity | 42,820 |  |  |
Total liabilities, redeemable convertible preferred stock, and stockholders' deficit | 49,510 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series A Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 0 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series B Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 0 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series C Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 0 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series C-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 0 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series D-1 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | 0 |  |  |
Pro Forma [Member] | Subsequent Event [Member] | Series D-2 Convertible Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred stock value | $ 0 |  |  |

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + 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 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -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 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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