Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Bonus shares activity table

	Shares			Weighted average exercise price		Weighted average remaining contractual life		Aggregate intrinsic value (1)
Balance April 30, 2014		81,859		$	36.81		4.46	$	6,250
Granted		—			—		—		—
Exercised		—			—		—		—
Expired		(39,944	)	$	48.72		—		—
Balance May 1, 2015		41,915		$	25.44		3.59	$	—
Granted		79,556		$	4.89		—		—
Expired		(12,444	)	$	38.13		—		—
Exchanged / cancelled		(109,027	)	$	9.03		—		—
Balance April 30, 2016		—			—		—	$	—

Weighted-average Black-Scholes assumptions

	Fiscal Year Ended April 30, 2016
Expected term (years)	2.5-3.0
Expected volatility	79%-80%
Dividend yield	0
Risk-free interest rate	.90% -1.01%
Weighted average per share grant date fair value	$2.34 - $3.09

Summary of warrant activity

	Shares			Weighted average exercise price		Weighted average remaining contractual life years		Aggregate intrinsic value (1)
Balance May 1, 2014		161,925		$	24.27		3.34		—
Issued		940,833		$	7.88				—
Exchanged		—			—
Expired		—			—
Balance April 30, 2015		1,102,758		$	10.56		4.12		—
Issued		16,667		$	7.50				—
Exchanged		(881,800	)	$	8.10
Expired		(30,000	)	$	7.50
Balance April 30, 2016		207,625		$	19.74		1.24		—