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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
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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)

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