Stockholders' Equity - Schedule of Company's Series of Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Class Of Stock [Line Items]
Preferred stock, shares authorized	200,000,000	0
Series A Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized		12,043,000
Preferred Stock Shares Issued And Outstanding		12,007,000
Aggregate liquidation preference		$ 12,007
Noncumulative Dividend Per Share Per Annum		$ 0.08
Series B Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized		10,758,000
Preferred Stock Shares Issued And Outstanding		10,758,000
Aggregate liquidation preference		$ 18,420
Noncumulative Dividend Per Share Per Annum		$ 0.14
Series C Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized		13,613,000
Preferred Stock Shares Issued And Outstanding		13,613,000
Aggregate liquidation preference		$ 55,000
Noncumulative Dividend Per Share Per Annum		$ 0.32
Series D Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized		7,584,000
Preferred Stock Shares Issued And Outstanding		7,584,000
Aggregate liquidation preference		$ 70,000
Noncumulative Dividend Per Share Per Annum		$ 0.74
Series E Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized		13,030,000
Preferred Stock Shares Issued And Outstanding		10,879,000
Aggregate liquidation preference		$ 150,456
Noncumulative Dividend Per Share Per Annum		$ 1.11
Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized	0	57,028,000
Preferred Stock Shares Issued And Outstanding	0	54,841,000
Aggregate liquidation preference	$ 0	$ 305,883