The Company and Basis of Presentation - Additional Information (Details)			3 Months Ended
	Apr. 12, 2016 USD ($) $ / shares shares	Mar. 10, 2015 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) Segment $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating segments | Segment			1
Offering costs | $			$ 98,000
Common stock, shares authorized			25,000,000	25,000,000
Common stock, par value | $ / shares			$ 0.0001	$ 0.0001
Stock split ratio			0.095
Working capital | $			$ 31,400,000
Accumulated deficit | $			(28,126,000)	$ (23,579,000)
Cash, cash equivalents and marketable securities | $			$ 29,000,000
Series A Convertible Preferred Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Preferred stock, shares authorized			2,172,524	2,172,524
Preferred stock, par value | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Series B Convertible Preferred Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued		4,929,948
Offering costs | $		$ 321,000
Preferred stock, shares authorized			5,008,210	5,008,210
Preferred stock, par value | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Convertible preferred stock converted into common stock			7,172,496
Subsequent Event
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Capital stock, shares authorized	510,000,000
Common stock, shares authorized	500,000,000
Preferred stock, shares authorized	10,000,000
Common stock, par value | $ / shares	$ 0.0001
Preferred stock, par value | $ / shares	$ 0.0001
Subsequent Event | Common Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from issuance of common stock upon initial public offering, net | $	$ 47,300,000
Subsequent Event | IPO
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Convertible preferred stock converted into common stock	7,172,496
Convertible preferred stock reclassified into common stock and additional paid-in-capital | $	$ 58,300,000
Subsequent Event | IPO | Common Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued	5,481,940
Public offering price | $ / shares	$ 10.00
Underwriting discounts and commissions | $	$ 3,800,000
Offering costs | $	$ 3,700,000
Subsequent Event | Underwriters' Over-allotment Option | Common Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued	481,940