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Subsequent Event - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2015 | Jul. 23, 2015 | Feb. 26, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  | $ 20,213,000 |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Convertible common stock shares |  |  | 26,000 |  |  |  |  |
Common shares issued upon conversion of convertible preferred stocks |  |  |  |  | 100 | 100 |  |
Preferred stock, shares outstanding |  |  |  |  | 17,430 | 17,430 |  | 43,000
Cowen |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  | $ 20,200,000 |  |
Common shares issued in initial public offering |  |  |  |  |  | 929,590 |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  |  | $ 0 |  |  |
Debt instrument, maturity date |  |  |  |  |  | Jul. 01, 2018 |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  |  | $ 0 |  |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche | Scenario Forecast |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Debt under Loan Agreement |  |  |  |  |  |  | $ 30,000,000 |
Debt instrument, maturity date |  |  |  |  |  | Jan. 01, 2019 |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Common shares issued upon conversion of convertible preferred stocks |  | 1,743,000 |  |  |  |  |  |
Subsequent Event | Common Stock | I P O |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Common shares issued in initial public offering | 5,227,273 |  |  |  |  |  |  |
Public offering net price per share | $ 27.50 |  |  |  |  |  |  |
Net proceeds from offering | $ 134,800,000 |  |  |  |  |  |  |
Subsequent Event | Common Stock | Over-Allotment Option |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Common shares issued in initial public offering | 681,818 |  |  |  |  |  |  |
Subsequent Event | Series B Convertible Preferred Stock |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Convertible common stock shares |  | 17,430 |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 |  |  |  |  |  |
Subsequent Event | Cowen |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 28,800,000 |  |  |  |
Common stock sales agreement aggregate sales proceeds to date |  |  |  | $ 50,000,000 |  |  |  |

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