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Stock-Based Compensation - Summary of Changes in Unvested Restricted Stock Units (Detail) (Restricted stock units [Member], USD $)
3 Months Ended
Jun. 30, 2014
Restricted stock units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of RSUs, Beginning balance 3,144,940
Number of RSUs, Granted 810,000
Number of RSUs, Vested (442,500)
Number of RSUs, Cancelled (375,000)
Number of RSUs, Ending balance 3,137,440
Weighted-average grant date fair value, Beginning balance $ 1.66
Weighted-average grant date fair value, Granted $ 1.48
Weighted-average grant date fair value, Vested $ 2.22
Weighted-average grant date fair value, Cancelled $ 1.76
Weighted-average grant date fair value, Ending balance $ 1.53