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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Summary of Financial Assets and Liabilities Measured on Recurring Basis at Fair Value | A summary of the financial assets and liabilities that are measured on a recurring basis at fair value as of December 31, 2014 and 2013, is as follows (in thousands):
|  |  |  |  |  | Fair Value Measurements Using |
|  | Carrying |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 50,541 |  |  | $ | — |  |  | $ | 50,541 |  |  | $ | — |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 5,233 |  |  | $ | — |  |  | $ | 5,233 |  |  | $ | — |
Preferred stock warrant liability |  |  | 928 |  |  |  | — |  |  |  | — |  |  |  | 928 |
Reconciliation of Company's Liabilities Measured at Fair Value on Recurring Basis Using Unobservable Inputs (Level 3) | The reconciliation of the Company’s liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) is as follows:
|  | Preferred Stock Warrant |
|  | Series B |  |  | Series C |  |  | Series D |  |  | Total |
Balance — December 31, 2012 |  | $ | 7 |  |  | $ | 500 |  |  | $ | 623 |  |  | $ | 1,130 |
Decrease in fair value recorded in other income |  |  | (3 | ) |  |  | (114 | ) |  |  | (85 | ) |  |  | (202 | )
Balance — December 31, 2013 |  |  | 4 |  |  |  | 386 |  |  |  | 538 |  |  |  | 928 |
Fair value reclassified to additional paid-in capital in connection with the IPO on April 15, 2014 |  |  | (4 | ) |  |  | (386 | ) |  |  | (538 | ) |  |  | (928 | )
Balance — December 31, 2014 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Fair Value of Preferred Stock Warrants Calculated using Black-Scholes Assumptions | The Company’s warrants were valued using the Black-Scholes option-pricing model. The fair values were derived by applying the following assumptions:
|  | December 31, 2013 |
Expected life |  | 4-8 years |
Risk-free interest rate |  |  | 2.90 | %
Expected volatility |  | 64%-84% |
Expected dividend rate |  | —% |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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