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Summary of Significant Accounting Policies - Net Loss Per Share (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 23, 2013
USD ($)
Jun. 26, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
segment
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Net Loss Per Share                              
Anti-dilutive securities (in shares) | shares                         1,356,000 2,852,000 1,794,000
Deemed dividend (in dollars)                             $ (3,429,000)
Basic numerator:                              
Net loss         $ 7,757,000 $ (10,037,000) $ (8,868,000) $ (6,444,000) $ (1,349,000) $ (6,278,000) $ (5,044,000) $ (3,751,000) $ (17,592,000) $ (16,422,000) (60,259,000)
Net deemed contribution on exchange of preferred stock                             144,765,000
Net income (loss) attributable to common stockholders for basic net income (loss) per share                         $ (17,592,000) $ (16,422,000) $ 84,506,000
Denominator:                              
Weighted average common shares outstanding | shares                         39,015,131 31,390,631 2,472,581
Basic net income (loss) per common share (in dollars per share) | $ / shares         $ 0.19 $ (0.25) $ (0.22) $ (0.19) $ (0.04) $ (0.20) $ (0.16) $ (0.12) $ (0.45) $ (0.52) $ 34.18
Diluted numerator:                              
Net income (loss) attributable to common stockholders for basic net income (loss) per share                         $ (17,592,000) $ (16,422,000) $ 84,506,000
Deemed contribution                             144,765,000
Net loss attributable to common stockholders for diluted net loss per share                         $ (17,592,000) $ (16,422,000) $ (60,259,000)
Denominator                              
Weighted average common shares outstanding | shares                         39,015,131 31,390,631 2,472,581
Dilutive effect of conversion of convertible preferred stock | shares                             13,173,208
Weighted Average Number of Shares Outstanding, Diluted | shares                         39,015,131 31,390,631 15,645,789
Diluted net loss per common share | $ / shares         $ 0.19 $ (0.25) $ (0.22) $ (0.19) $ (0.04) $ (0.20) $ (0.16) $ (0.12) $ (0.45) $ (0.52) $ (3.85)
Segment Reporting                              
Number of Operating Segments | segment                         1    
Stock-Based Compensation                              
Stock-based compensation expense                         $ 4,869,000 $ 1,861,000 $ 198,000
Employee stock options                              
Net Loss Per Share                              
Anti-dilutive securities (in shares) | shares                         1,281,000 2,827,000 1,794,000
Employee Stock Purchase Plan                              
Net Loss Per Share                              
Anti-dilutive securities (in shares) | shares                         75,000 25,000  
Stock-Based Compensation                              
Stock-based compensation expense                         $ 341,000 $ 172,000  
Series A-1 Convertible Preferred Stock                              
Net Loss Per Share                              
Deemed dividend (in dollars) $ 2,300,000 $ 1,000,000   $ 1,000,000                      
Deemed contribution     $ 2,300,000                        
Diluted numerator:                              
Deemed contribution                             $ 148,100,000