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Debt Obligations - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  | 1 Months Ended |  |  | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Jan. 31, 2014 | Dec. 31, 2011 | May 07, 2014 Subsequent Event [Member] | Apr. 30, 2010 2010 Credit Agreement [Member] | Mar. 31, 2013 2010 Credit Agreement [Member] | Dec. 31, 2012 December 2011 Note and Warrant Agreement [Member] | Dec. 11, 2013 2011-2012 Notes [Member] | Mar. 31, 2014 2011-2012 Notes [Member] | Dec. 31, 2012 2011-2012 Notes [Member] | Dec. 31, 2011 2011-2012 Notes [Member] | Dec. 11, 2013 June 2013 Note and Warrant Agreement [Member] | Jun. 30, 2013 June 2013 Note and Warrant Agreement [Member] | Mar. 31, 2013 June 2013 Note and Warrant Agreement [Member] | Mar. 31, 2014 June 2013 Note and Warrant Agreement [Member] | Mar. 31, 2014 2013 Credit Agreement [Member] | Dec. 31, 2013 2013 Credit Agreement [Member] | Dec. 11, 2013 Series D-2 Convertible Preferred Stock [Member] | Dec. 11, 2013 Series D-2 Convertible Preferred Stock [Member] 2011-2012 Notes [Member] | Dec. 11, 2013 Series D-2 Convertible Preferred Stock [Member] June 2013 Note and Warrant Agreement [Member] | Dec. 11, 2013 Series D-1 Convertible Preferred Stock [Member] | Dec. 11, 2013 Series D-1 Convertible Preferred Stock [Member] 2011-2012 Notes [Member] | Mar. 31, 2013 2013 Credit Agreement [Member] | May 07, 2014 2013 Credit Agreement [Member] Subsequent Event [Member] | Apr. 30, 2010 Term Loan [Member] 2010 Credit Agreement [Member] | Apr. 30, 2010 Revolving Credit Facility [Member] 2010 Credit Agreement [Member] | Mar. 17, 2014 Two Thousand Thirteen Credit Facility [Member] | Jun. 30, 2014 Two Thousand Thirteen Credit Facility [Member] Forecast [Member] | Dec. 31, 2011 Maximum [Member] December 2011 Note and Warrant Agreement [Member]
Debt Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility agreement amount |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 10,000,000 |  |  |  |  |  |  |  | $ 5,000,000 | $ 10,000,000 |  |  |
Interest at a rate of London InterBank plus |  |  |  |  |  | 0.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deemed contribution of a loan guarantee |  | 3,930,000 |  |  |  | 6,338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,930,000 |  |  |  |  |  |
Unamortized deferred financing costs |  |  |  |  |  |  | 153,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs | 536,000 | 709,000 |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate | 1.19% | 1.37% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 44,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repayments from proceeds from IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |
Borrowings to pay outstanding amounts under credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |
Repayment date of credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 |  |
Outstanding debt |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Debt agreement, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000
Convertible notes aggregate amount |  |  |  |  |  |  |  |  |  |  |  | 11,444,000 |  | 899,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued to purchase common stock |  |  | 19,048 | 26,000 |  |  |  |  |  |  |  | 26,000 |  |  |  |  |  |  | 87,532 |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  | 0.20 | 0.20 |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |
Notes stated interest rate |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required percentage written consent by holders of outstanding aggregated principle amount of convertible notes | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of issued warrants |  |  |  |  |  |  |  | 328,000 |  |  |  |  |  | 1,168,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of issued warrants above the face value of the Notes expensed at issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 269,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining amount of the fair value of issued warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | 899,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal |  |  |  |  |  |  |  |  | 11,444,000 |  |  |  | 899,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  | $ 1,640,000 |  |  |  | $ 33,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares converted to preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,956,985 | 3,291,443 | 665,542 | 6,054,255 | 6,054,255 |  |  |  |  |  |  |
Convertible preferred stock conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.40 | $ 1.40 |  | $ 1.40 |  |  |  |  |  |  |
Conversion price adjusted per share |  |  |  |  |  |  |  |  | $ 1.40 |  |  |  | $ 1.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of net proceeds used for repayment of outstanding debt. + References No definition available. + Details
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- Details
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- Definition Deemed contribution of a loan guarantee. + References No definition available. + Details
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- Definition Fair value of warrants allocated to debt discount. + References No definition available. + Details
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- Definition Fair value of warrants expensed at issuance. + References No definition available. + Details
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- Definition Fair value of warrants issued. + References No definition available. + Details
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- Definition Line of credit facility repayment date. + References No definition available. + Details
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- Definition Loans repayment from initial public offerings proceeds. + References No definition available. + Details
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- Definition Maximum Borrowing Capacity Under Debt Agreement. + References No definition available. + Details
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- Definition Required percentage written consent by holders of outstanding aggregated principle amount of convertible notes. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22) -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 03 -Paragraph 16 -Article 9 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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