Description of Business and Summary of Significant Accounting Policies - Activity for Liabilities Measured at Estimated Fair Value Using Unobservable Inputs (Detail) - Significant Other Unobservable Inputs (Level 3) [Member] - Warrants [Member] $ in Thousands	3 Months Ended
Jun. 30, 2015 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Warrant Derivative Liability, Beginning balance	$ 126
Issuances	0
Adjustments to estimated fair value	38
Warrant liability removal due to settlements	(138)
Warrant liability reclassified to equity	0
Warrant Derivative Liability, Ending balance	$ 26

Description of Business and Summary of Significant Accounting Policies - Activity for Liabilities Measured at Estimated Fair Value Using Unobservable Inputs (Detail) - Significant Other Unobservable Inputs (Level 3) [Member] - Warrants [Member]
$ in Thousands

3 Months Ended

Jun. 30, 2015

USD ($)

Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

Warrant Derivative Liability, Beginning balance

$ 126

Issuances

Adjustments to estimated fair value

Warrant liability removal due to settlements

(138)

Warrant liability reclassified to equity

Warrant Derivative Liability, Ending balance

$ 26