Stock Option Plans (Details) - 2012 Plan [Member] - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)	10,000,000
Common shares, new shares issued (in shares)	10,027
Reduction ratio in shares available for grant	2
Options and Restricted Stock Available for Grant [Rollforward]
Beginning of the period (in shares)	5,257,000
Options granted (in shares)	(1,796,000)
RSUs granted (in shares)	(200,000)
Common stock issued to consultant in lieu of cash (in shares)	(20,000)
Options exercised (in shares)	0
Options forfeited/cancelled (in shares)	275,000
End of the period (in shares)	3,516,000
Number of Options and Restricted Stock Outstanding [Rollforward]
Outstanding, beginning of the period (in shares)	5,194,000
Options granted (in shares)	1,796,000
RSUs granted (in shares)	100,000
Options exercised (in shares)	0
Options forfeited/cancelled (in shares)	(493,000)
Outstanding, end of the period (in shares)	6,597,000
Weighted Average Exercise Price [Rollforward]
Outstanding, beginning of the period (in dollars per share)	$ 3.93
Options granted (in dollars per share)	2.87
RSUs granted (in dollars per share)	0
Options exercised (in dollars per share)	0
Options forfeited/cancelled (in dollars per share)	4.46
Outstanding end of the period (in dollars per share)	$ 3.61
Weighted-average assumptions [Abstract]
Expected life	5 years 11 months 19 days	5 years 5 months 26 days
Risk-free interest rates	1.43%	1.68%
Volatility	60.77%	64.01%
Dividend yield	0.00%	0.00%