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Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Numerator:                      
Net loss $ (6,925) $ (2,768) $ (7,325) $ (10,355) $ (3,363) $ (2,957) $ (7,698) $ (9,121) $ (27,373) $ (23,139) $ (48,656)
Denominator:                      
Weighted-average shares of common stock outstanding (in shares)                 14,231 13,295 8,559
Weighted-average shares subject to repurchase (in shares)                 (427) (117) (82)
Shares used in per-share calculation ― basic (in shares)                 13,804 13,178 8,477
Shares used in per-share calculation ― diluted (in shares)                 13,804 13,178 8,477
Net loss per share ― basic (in dollars per share) $ (0.50) $ (0.20) $ (0.53) $ (0.76) $ (0.25) $ (0.22) $ (0.57) $ (0.75) $ (1.98) $ (1.76) $ (5.74)
Net loss per share ― diluted (in dollars per share) $ (0.50) $ (0.20) $ (0.53) $ (0.76) $ (0.25) $ (0.22) $ (0.57) $ (0.75) $ (1.98) $ (1.76) $ (5.74)