XML 70 R47.htm IDEA: XBRL DOCUMENT v3.4.0.3
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, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Accounting Policies [Abstract]                      
Net loss $ (3,363) $ (2,957) $ (7,698) $ (9,121) $ (3,363) $ (6,353) $ (25,423) $ (13,517) $ (23,139) $ (48,656) $ (56,258)
Weighted-average shares of common stock outstanding                 13,295 8,559 6,411
Weighted-average shares subject to repurchase                 (117) (82) (149)
Shares used in per-share calculation ― basic                 13,178 8,477 6,262
Shares used in per-share calculation ― diluted                 13,178 8,477 6,262
Net loss per share ― basic $ (0.25) $ (0.22) $ (0.57) $ (0.75) $ (0.36) $ (0.72) $ (3.12) $ (1.74) $ (1.76) $ (5.74) $ (8.98)
Net loss per share ― diluted $ (0.25) $ (0.22) $ (0.57) $ (0.75) $ (0.36) $ (0.72) $ (3.12) $ (1.74) $ (1.76) $ (5.74) $ (8.98)